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Posted: 4/8/2024 10:44:40 PM EDT
[Last Edit: -JC-]
   I'm getting a ring of brass flow when resizing 41mag Starline brass. Brass was new, so I'm wondering if it was just thicker than normal? I have some once fired PMC brass bit it hasn't been cleaned yet so I can't compare resizing just yet. I used a Lanolin based lube and let it sit for a couple hours before resizing so any alcohol would dry off leaving only Lanolin. Could this be a lube issue? A die problem or a case thickness issue? Resizing die is a Dillon SQDB, and I cleaned it to ensure no residual lube. No brass build-up, no galling apparent on the carbide face. I shot 10 of these and they were fine but I'm worried about brass life. 04/29 Update: Kudos to Dillon for a 1 day turnaround for this warranty. 
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Posted: 4/8/2024 10:54:31 PM EDT
[Last Edit: dryflash3]
[#1]
That ring is where the case transition's from the solid head and the start of the case walls.
Case walls can be sized but the solid head cannot. So sizing stopped at that mark. Not sure why you are getting that, maybe over expanded cases with hot loads? Could it be the sizing die? How it's adjusted? Hard to tell on this end of the internet. Try chambering them. If they chamber, shoot them. BTW, congratulations on finding a 41 mag Conversion for your SDB. I looked a long while for a 32 H&R Mag conversion before I found one. |
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Posted: 4/8/2024 10:56:41 PM EDT
[#2]
What brand dies are you using? Wondering about the chamfer that should be on the entry of the die.
Can you do a measurement of the ring, and then the body right above the ring? (Need a micrometer to do this accurately). That case doesn't look like the ring is from the brass flowing or stretching, it's just so sharp and definite. Have you tried to size an unfired case to see what happens, if that ring appears or not? |
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Posted: 4/8/2024 11:01:38 PM EDT
[#3]
The die is a Dillon factory Square deal b.
Brass is brand new. Lanolin lube was used. I'll measure the die and the cases tomorrow. |
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Posted: 4/8/2024 11:06:21 PM EDT
[#4]
another .41 fan subscribing for outcome. Best wishes!
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Posted: 4/8/2024 11:06:44 PM EDT
[#5]
Quote HistoryOriginally Posted By -JC-: The die is a Dillon factory Square deal b. Brass is brand new. Lanolin lube was used. I'll measure the die and the cases tomorrow. Play with it a bit. BTW I never use lube when sizing on my SDB's. Not needed when I'm loading 44 Mag or 45 Colt. Just adds a step to clean off lube. |
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IA, USA
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Posted: 4/9/2024 2:20:02 AM EDT
[Last Edit: Urimaginaryfrnd]
[#6]
Starline brass usually doesn’t arrive bent like Winchester brass so I don’t always size the virgin brass. Carbide dies with straight wall brass don’t require lube. The base below that ring is covered by the shell plate or shell holder and such a ring is not uncommon when brass is run through a size die. Even so you will probably get lots of life out of that brass loading it many times before it splits. Looks OK to me. Wipe the lube off with a rag it will look better.
Note sometimes dirt builds up in a shell holder and it needs cleaning for the brass to fit all the way in. |
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FL, USA
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Posted: 4/9/2024 7:58:29 AM EDT
[#7]
I don’t know about you guys, but those cartridges sure look like imminent head/neck separations to me.
I would be very leery about shooting them. Chris |
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Posted: 4/9/2024 8:10:16 AM EDT
[#8]
I would probably not shoot them unless I was certain the case wasn’t compromised. As someone else said, I wonder if the sizing die has a proper chamfer. I’ve loaded tens of thousands of straight walled revolver ammo including lots of .41 and never seen that. You might also contact starline. I’ve used lots of their .41 brass with no issues like that
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Posted: 4/9/2024 11:18:26 AM EDT
[#9]
Raise your die up high enough to eliminate this deformity to see if the cases will chamber without binding.
You only need to resize to just above the internal level of the case head, maybe not even that much. |
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Posted: 4/9/2024 11:21:20 AM EDT
[#10]
My magnum handguns all get fed lead SWC traveling around 1000 fps. .357, .41 mag, doesn't matter. If you are maximum loads I would back off some.
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Posted: 4/9/2024 11:39:21 AM EDT
[#11]
Quote HistoryOriginally Posted By borderpatrol: Raise your die up high enough to eliminate this deformity to see if the cases will chamber without binding. You only need to resize to just above the internal level of the case head, maybe not even that much. I do, and he posts good info. |
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KS, USA
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Posted: 4/9/2024 3:24:40 PM EDT
[Last Edit: bowmanch]
[#12]
Can you resize one without lube to compare?
This might be a version of hydraulic compression with too much lube on the case |
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Posted: 4/9/2024 3:30:46 PM EDT
[#13]
@The_Dog
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Posted: 4/9/2024 4:02:32 PM EDT
[#14]
Quote HistoryOriginally Posted By bowmanch: Can you resize one without lube to compare? This might be a version of hydraulic compression with too much lube on the case Cleaned the die and then tried to resize 1 case with no lube. Same result. |
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Posted: 4/9/2024 4:19:19 PM EDT
[#15]
 Selection of 5 fired cases from yesterday. |
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Posted: 4/9/2024 4:27:34 PM EDT
[#16]
 sized case wall thickness.  unsized case diameter.  diameter on the sized ring.
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Posted: 4/9/2024 4:28:29 PM EDT
[#17]
 
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Posted: 4/9/2024 4:30:33 PM EDT
[#18]
 I polished the case on the left with some steel wool. Still a slight ring. |
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IA, USA
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Posted: 4/9/2024 5:40:16 PM EDT
[#19]
your die does not have enough radius or bevel on the face of the carbide. That is what is causing this. Raise the die till it stops or call Dillon and have them replace the die.
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Posted: 4/9/2024 5:46:09 PM EDT
[#20]
I emailed photos to Dillon.
They are issuing an RMA for the die. |
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Posted: 4/10/2024 11:02:39 AM EDT
[#21]
Quote HistoryOriginally Posted By backbencher: @The_Dog Nope... I've not used any Starline brass. I've got mostly Remington, Winchester and PMC brass. On some of the W-W Super brass, I can see a very, very faint ring. Nothing on the other brands. Some of this brass is on it's second reloading. I'm also using a Dillion Square Deal. |
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USA
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Posted: 4/10/2024 7:57:36 PM EDT
[#22]
Lets see the die. Maybe the radius isnt blended right.
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USA
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Posted: 4/11/2024 9:27:40 PM EDT
[#23]
Quote HistoryOriginally Posted By ChrisGarrett: I don’t know about you guys, but those cartridges sure look like imminent head/neck separations to me. I would be very leery about shooting them. Chris Agreed. |
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USA
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Posted: 4/11/2024 11:42:49 PM EDT
[#24]
It appears to me as if the ridge does not go all the way around the case. That implies a misalignment between the case and the die.
These are things I'd try before sending the die to Dillon, because it may not be their fault. 1. Clean the shell holder/plate. There could be a film of crud built up that is preventing the case from aligning itself with the die (forcing the case to be out of alignment). If the ridge is always outboard of the shell plate, I would suspect this to be the cause. 2. Find out which side has the ridge, loosen the lock ring and push the top of the die away from the side where the ridge is forming. Send a case up into the die, and while the handle is still down, re-tighten the lock ring. This type of misalignment can cause a ridge at any location but it would always be the same location. |
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Posted: 4/12/2024 12:58:47 AM EDT
[#25]
I'll try cleaning up the shellplate and see if I can pin down exactly what side is dragging. Thanks for the suggestion.
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Posted: 4/12/2024 1:54:46 AM EDT
[#26]
Quote HistoryOriginally Posted By -JC-: I'll try cleaning up the shellplate and see if I can pin down exactly what side is dragging. Thanks for the suggestion. Running the case up into the die and then tightening the die down is how I do all adjustment of dies. Case will be centered in the die the best it can be this way. |
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Posted: 4/29/2024 5:43:28 PM EDT
[#27]
 I had a shipping notification 1 day after my package arrived at Dillon for warranty. They replaced the plate and polished the die and powder funnel for me. |
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Posted: 4/29/2024 5:46:54 PM EDT
[#28]
Not being mean, but this was preventable with a good go round of press maintenance. Just goes to show a lot of problems are reloader induced and not the fault of the OEM at all.
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Posted: 4/29/2024 10:25:13 PM EDT
[#29]
Perhaps, but I own two Dillon SQDB presses and have never known to change out the blue plate on the toolhead.
Asking for help here from the community was my next step after running out of ideas to fix it and this was a good learning experience. Dillon customer service is fantastic and the fact that they took the time to hand write a note explaining the situation, and get it out the door in a day, has me sold even further as a customer for life. |
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Posted: 4/29/2024 10:28:18 PM EDT
[#30]
Quote HistoryOriginally Posted By -JC-: https://www.ar15.com/media/mediaFiles/45582/20240429_142447-3201482.jpg https://www.ar15.com/media/mediaFiles/45582/20240429_142328-3201480.jpg I had a shipping notification 1 day after my package arrived at Dillon for warranty. They replaced the plate and polished the die and powder funnel for me. Thanks for the update, and good on Dillon. 
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USA
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Posted: 4/30/2024 1:27:26 AM EDT
[#31]
Quote HistoryOriginally Posted By -JC-: Perhaps, but I own two Dillon SQDB presses and have never known to change out the blue plate on the toolhead. Asking for help here from the community was my next step after running out of ideas to fix it and this was a good learning experience. Dillon customer service is fantastic and the fact that they took the time to hand write a note explaining the situation, and get it out the door in a day, has me sold even further as a customer for life. Good deal! Dillon is one of the very best. |
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