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Posted: 2/1/2022 2:20:50 PM EDT
[#1]
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Posted: 2/1/2022 2:21:09 PM EDT
[#2]
.50?
458socom 450bm 50beo |
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Posted: 2/1/2022 2:22:06 PM EDT
[#3]
Quote History ETA. You edited while i was searching for picture. 
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Posted: 2/1/2022 2:23:06 PM EDT
[#4]
Quote HistoryQuoted: https://cdn.athlonoutdoors.com/wp-content/uploads/sites/13/2020/05/shtf-50-upper-conversion-lead.jpg ETA. You edited while i was searching for picture. Quote HistoryQuoted: https://cdn.athlonoutdoors.com/wp-content/uploads/sites/13/2020/05/shtf-50-upper-conversion-lead.jpg ETA. You edited while i was searching for picture.
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Posted: 2/1/2022 2:24:34 PM EDT
[#5]
...and does it kick?
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Posted: 2/1/2022 2:24:42 PM EDT
[#6]
Did OP mean "...that can still be magazine fed" ??
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Posted: 2/1/2022 2:25:28 PM EDT
[#7]
Quote HistoryQuoted: Did OP mean "...that can still be magazine fed" ?? |
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Posted: 2/1/2022 2:25:38 PM EDT
[#8]
Quote HistoryQuoted: Did OP mean "...that can still be magazine fed" ?? The .50 BMG is magazine fed.
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Posted: 2/1/2022 2:47:12 PM EDT
[#9]
20mm vs 50bmg
We're going to need a bigger lower. |
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Posted: 2/1/2022 2:47:54 PM EDT
[#10]
Quote HistoryI don't know of any 20mm uppers yet.
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Posted: 2/1/2022 2:48:42 PM EDT
[#11]
Quote HistoryQuoted: That's how I took it, the cartridge must be mag fed. Quote HistoryQuoted: Quoted: Did OP mean "...that can still be magazine fed" ?? There Are side-fed AR15 uppers for .50 as well. They still pin to a standard AR15 lower. |
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Posted: 2/1/2022 2:48:44 PM EDT
[#12]
Quote HistoryQuoted: I don't know of any 20mm uppers yet. Quote HistoryQuoted: I don't know of any 20mm uppers yet. |
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Posted: 2/1/2022 2:49:35 PM EDT
[#13]
Quote HistoryQuoted: I bet PSA is on it. Quote HistoryQuoted: Quoted: I don't know of any 20mm uppers yet. 
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Posted: 2/1/2022 2:49:45 PM EDT
[#14]
a 20mm upper would be neat, maybe with a over-the-shoulder reaction tube/venturi recoilless rifle setup it could be feasible.
It would still be a DD unless you could get a sporting clause for it. See, that's why we had to make it 37mm. |
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Posted: 2/1/2022 2:50:33 PM EDT
[#15]
Something in the 40 watt range.
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Posted: 2/1/2022 2:51:56 PM EDT
[#16]
OP do you mean through a standard magwell lower Aar that would exclude the SHTF 50?
And do you mean biggest caliber? Or most power? |
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Posted: 2/1/2022 2:54:15 PM EDT
[#17]
Quote HistoryQuoted: I bet PSA is on it. And I own a BCA 450BM upper. |
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Posted: 2/1/2022 2:56:17 PM EDT
[#18]
Quote HistoryQuoted: Did OP mean "...that can still be magazine fed" ?? 50 bmg 
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Posted: 2/1/2022 7:34:46 PM EDT
[#19]
Quote HistoryQuoted: There Are side-fed AR15 uppers for .50 as well. They still pin to a standard AR15 lower. Quote HistoryQuoted: Quoted: Quoted: Did OP mean "...that can still be magazine fed" ?? There Are side-fed AR15 uppers for .50 as well. They still pin to a standard AR15 lower. |
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Posted: 2/1/2022 7:37:36 PM EDT
[#20]
Serious question: Is the AR hammer spring powerful enough to reliably ignite a 50 BMG primer? Those mofos are HARD.
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Posted: 2/1/2022 7:40:27 PM EDT
[#21]
We need an AR lower that will handle those Nitro Express rounds. Fun for all ages* at $100 per squeeze.
* Not all ages and excludes most people. |
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Posted: 2/1/2022 7:43:43 PM EDT
[#22]
Quote HistoryQuoted: But the mag doesn't go 'in' the upper. Look again. |
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Posted: 2/1/2022 7:54:07 PM EDT
[#23]
Quote HistoryQuoted: Serious question: Is the AR hammer spring powerful enough to reliably ignite a 50 BMG primer? Those mofos are HARD. The Safety Harbor 50BMG uppers come with a new hammer and hammer spring for this application. |
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Posted: 2/1/2022 7:55:10 PM EDT
[#24]
My search for an AR in .950 jdj did not return any hits.
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Posted: 2/1/2022 7:55:50 PM EDT
[#25]
Quote HistoryQuoted: Look again. Quote HistoryQuoted: Quoted: But the mag doesn't go 'in' the upper. Look again. |
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Posted: 2/1/2022 8:05:13 PM EDT
[#26]
50 Beowulf is the largest caliber for a semi-auto mag fed AR15. Largest, as in most powerful, most practical caliber, would have to be the 6.8 SPC I would say.
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Posted: 2/1/2022 8:11:51 PM EDT
[#27]
Quote HistoryQuoted: 50 Beowulf is the largest caliber for a semi-auto mag fed AR15. Largest, as in most powerful, most practical caliber, would have to be the 6.8 SPC I would say. Most powerful and most practical are completely different measures. |
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Posted: 2/1/2022 8:13:04 PM EDT
[#28]
Quote HistoryQuoted: But the mag doesn't go 'in' the lower. Quote HistoryQuoted: Quoted: Quoted: Quoted: Did OP mean "...that can still be magazine fed" ?? There Are side-fed AR15 uppers for .50 as well. They still pin to a standard AR15 lower. Still a mag fed cartridge, using an unmodified AR15 lower. For max power in a convential configuration, .450 Bushmaster/.458 Socom/.50 Beowulf. Socom probably has the edge in pure power, Beowulf in terms of "largest caliber". Wildcatters have been loading .45 V-Rap in AR15 lowers too. Basically a .45 Raptor loaded to a bit lower pressure to account for the small frame. If you don't know, .45 raptor is a .308 or .30-06, cut to 1.8", with the neck reamed to fit a .452 bullet and loaded according to .460S&W load data. Designed for AR10 uppers and straight wall caliber deer hunting states. Then people realized it would fit in the shorter AR15 magazines and went from there. |
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Posted: 2/1/2022 8:14:04 PM EDT
[#29]
How do you want to measure biggest?
Magazine fed? If you are just using the lower to hold the trigger group, there is no limit. |
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Posted: 2/1/2022 8:14:20 PM EDT
[#30]
Quote HistoryQuoted: We need an AR lower that will handle those Nitro Express rounds. Fun for all ages* at $100 per squeeze. * Not all ages and excludes most people. Unless someone comes up with a muzzle brake more effective than what's on a .50BMG, you don't have enough money to get me to fire a Nitro Express caliber in a rifle that light. |
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Posted: 2/1/2022 8:20:56 PM EDT
[#31]
Quote HistoryQuoted: Still a mag fed cartridge, using an unmodified AR15 lower. For max power in a convential configuration, .450 Bushmaster/.458 Socom/.50 Beowulf. Socom probably has the edge in pure power, Beowulf in terms of "largest caliber". Wildcatters have been loading .45 V-Rap in AR15 lowers too. Basically a .45 Raptor loaded to a bit lower pressure to account for the small frame. If you don't know, .45 raptor is a .308 or .30-06, cut to 1.8", with the neck reamed to fit a .452 bullet and loaded according to .460S&W load data. Designed for AR10 uppers and straight wall caliber deer hunting states. Then people realized it would fit in the shorter AR15 magazines and went from there. What is performance of 45 VRAP? Most powerful AR-15 round I know of is the 7VAR which is basically 308 performance in an AR15. It can do 168 grains at 2,600FPS. That gives it a very slight edge over the big bores in terms of muzzle energy. |
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Posted: 2/1/2022 8:22:26 PM EDT
[#32]
Quote HistoryI can only imagine the pain that thing can bring - from both ends. |
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Posted: 2/1/2022 8:30:38 PM EDT
[#33]
The biggest thing I know of is the .500 Phantom.
You could go bigger bullet, strictly speaking, I'm thinking you could do 20 gauge (.620ish bullet) through the WSSM extension. |
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Posted: 2/1/2022 8:33:21 PM EDT
[#34]
Quote HistoryQuoted: What is performance of 45 VRAP? Most powerful AR-15 round I know of is the 7VAR which is basically 308 performance in an AR15. It can do 168 grains at 2,600FPS. That gives it a very slight edge over the big bores in terms of muzzle energy. Quote HistoryQuoted: Quoted: Still a mag fed cartridge, using an unmodified AR15 lower. For max power in a convential configuration, .450 Bushmaster/.458 Socom/.50 Beowulf. Socom probably has the edge in pure power, Beowulf in terms of "largest caliber". Wildcatters have been loading .45 V-Rap in AR15 lowers too. Basically a .45 Raptor loaded to a bit lower pressure to account for the small frame. If you don't know, .45 raptor is a .308 or .30-06, cut to 1.8", with the neck reamed to fit a .452 bullet and loaded according to .460S&W load data. Designed for AR10 uppers and straight wall caliber deer hunting states. Then people realized it would fit in the shorter AR15 magazines and went from there. What is performance of 45 VRAP? Most powerful AR-15 round I know of is the 7VAR which is basically 308 performance in an AR15. It can do 168 grains at 2,600FPS. That gives it a very slight edge over the big bores in terms of muzzle energy. .45VRap is slightly under, or equal to .460S&W(a bit higher velocity if you compare rifle length vs handgun length barrels), depending on how cautious the person loading is. Some guys taper it off to account for the smaller barrel extension of the AR15 vs AR10, some load full power. Full power, .460 equivalent seems extreme to me in the small frame guns, but I haven't heard of one blowing up. Starline offers .45 Raptor brass for better performance, and a lot less work, than trimming rifle brass. Then add a .308 shell holder to ,460 S&W dies, and work up your load. |
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Posted: 2/1/2022 8:33:44 PM EDT
[#35]
Quote HistoryQuoted: The biggest thing I know of is the .500 Phantom. You could go bigger bullet, strictly speaking, I'm thinking you could do 20 gauge (.620ish bullet) through the WSSM extension. 500 Phantom is AR-10. I think 500 Auto Max has more power than the phantom, but I'm not 100% sure It's been awhile since I looked at the specs. |
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Posted: 2/1/2022 8:34:41 PM EDT
[#36]
50 BMG.
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Posted: 2/1/2022 8:36:48 PM EDT
[#37]
Quote HistoryQuoted: .45VRap is slightly under, or equal to .460S&W(a bit higher velocity if you compare rifle length vs handgun length barrels), depending on how cautious the person loading is. Some guys taper it off to account for the smaller barrel extension of the AR15 vs AR10, some load full power. Full power, .460 equivalent seems extreme to me in the small frame guns, but I haven't heard of one blowing up. Starline offers .45 Raptor brass for better performance, and a lot less work, than trimming rifle brass. Then add a .308 shell holder to ,460 S&W dies, and work up your load. Wouldn't that put .45VRap below the big three offerings? I know the 458S handily beats 460 S&W performance. So a bit confused on what the draw is? Unless barrel length makes that big of a difference, but wouldn't think that it would unless rifle powders are used. |
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Posted: 2/1/2022 8:42:19 PM EDT
[#38]
Quote HistoryQuoted: The biggest thing I know of is the .500 Phantom. You could go bigger bullet, strictly speaking, I'm thinking you could do 20 gauge (.620ish bullet) through the WSSM extension. Good luck feeding a .500 Phantom. Before he left the country a couple years ago Marty said some ammo companies had shown interest in bringing the caliber mainstream but I don't think anything ever came of it. |
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Posted: 2/1/2022 8:44:01 PM EDT
[#39]
Quote HistoryQuoted: Wouldn't that put .45VRap below the big three offerings? I know the 458S handily beats 460 S&W performance. So a bit confused on what the draw is? Unless barrel length makes that big of a difference, but wouldn't think that it would unless rifle powders are used. Quote HistoryQuoted: Quoted: .45VRap is slightly under, or equal to .460S&W(a bit higher velocity if you compare rifle length vs handgun length barrels), depending on how cautious the person loading is. Some guys taper it off to account for the smaller barrel extension of the AR15 vs AR10, some load full power. Full power, .460 equivalent seems extreme to me in the small frame guns, but I haven't heard of one blowing up. Starline offers .45 Raptor brass for better performance, and a lot less work, than trimming rifle brass. Then add a .308 shell holder to ,460 S&W dies, and work up your load. Wouldn't that put .45VRap below the big three offerings? I know the 458S handily beats 460 S&W performance. So a bit confused on what the draw is? Unless barrel length makes that big of a difference, but wouldn't think that it would unless rifle powders are used. Never looked at the numbers for Socom but know it's a mean round(in a good way). The big attraction is for rifle deer hunting in states that allow straight wall cartridges but no bottlenecks. |
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Posted: 2/1/2022 8:45:24 PM EDT
[#40]
Quote HistoryQuoted: Good luck feeding a .500 Phantom. Before he left the country a couple years ago Marty said some ammo companies had shown interest in bringing the caliber mainstream but I don't think anything ever came of it. I've heard there is renewed interest but who knows. I think @Big-Bore is the authority on anything bigger than .308 in an AR platform.
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Posted: 2/1/2022 8:50:33 PM EDT
[#41]
Quote HistoryQuoted: Something in the 40 watt range. I found one in 100 watt range (not weaponized, but real). If you can retrofit this into an AR platform with some kind of mobile battery pack, you should work for DARPA. Burning Laser 
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Posted: 2/1/2022 8:53:23 PM EDT
[#42]
I remember a while ago that a manufacturer made a custom lower and upper chambered in .458 win mag.
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Posted: 2/1/2022 9:03:19 PM EDT
[#43]
Quote HistoryQuoted: I remember a while ago that a manufacturer made a custom lower and upper chambered in .458 win mag. |
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Posted: 2/1/2022 9:03:36 PM EDT
[#44]
Quote HistoryQuoted: Good luck feeding a .500 Phantom. Before he left the country a couple years ago Marty said some ammo companies had shown interest in bringing the caliber mainstream but I don't think anything ever came of it. He asked what the biggest was, not what was available. Yeah. SBR or somebody like that made noise about doing the Phantom, but nothing ever came of it. Too many bespoke parts. A .550 on the Weatherby case head probably would work. Still have to turn the bolt face and recut an extractor groove, along with the custom bolt and extension, but there is way more brass out there. You could maybe do a .577 on Ed Hubel's belted express case. I don't think anything bigger will fit trough the extension but I don't have one to measure |
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Posted: 2/1/2022 9:07:50 PM EDT
[#45]
Quote HistoryQuoted: Cobb. Quote HistoryQuoted: Quoted: I remember a while ago that a manufacturer made a custom lower and upper chambered in .458 win mag. Nemo did one too. I'd rather have their 7.5 inch .300 Winmag though. |
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Posted: 2/1/2022 9:18:07 PM EDT
[#46]
Quote HistoryQuoted: 20mm vs 50bmg We're going to need a bigger lower. https://qph.fs.quoracdn.net/main-qimg-fde510e6057e25e6f20e8d5250196b1f-c You vs. The guy she told you not to worry about...
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Posted: 2/1/2022 9:28:09 PM EDT
[#47]
375 SOCOM and 458 SOCOM have to be up there.
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Posted: 2/1/2022 9:34:18 PM EDT
[#48]
Correction. The .500 Phantom was not “just” an AR-10/LR-308 round. Most were in fact done on the AR-15 platform but had to use the Olympic special upper with “magnum” sized bolt face, but it did use a standard AR-15 lower. Also, it could only use hunting type bullets-300 to 500 gr.-that would keep COAL to 2.250-2.300 inches along with very modified mags.
The couple that were done on the LR/AR-10, including mine, were for shooting the BMG bullets, namely the M33 ball. My 16” tosses them at a hair under 1000 fps. The mags need minor tweaks but not too much, and if course uses a “magnum” bolt. SBR has been saying they are bringing back the Phantom for a couple years now but it’s still vapor ware. Another company was supposed to make brass but it never happened. The original company, German?, missed their time line by ages and raised their prices and minimum order to the point it killed the project. Here is a link to another post that has some pictures of the Phantom, page 2. |
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Posted: 2/1/2022 9:41:33 PM EDT
[#49]
Quote HistoryQuoted: 500 Phantom is AR-10. I think 500 Auto Max has more power than the phantom, but I'm not 100% sure It's been awhile since I looked at the specs. Nope. You can do it in the AR10, but it will fit in the AR15. It's been a minute but IIRC most of them were small frame. |
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Posted: 2/1/2022 10:52:37 PM EDT
[#50]
Then there is the 500 Auto Max, a rimless 500S&W magnum to feed in an semi-automatic rifle.
500 auto-max |
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