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Posted: 2/3/2017 11:37:26 PM EDT
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Working up my first 10mm loading.
projectile : 165gr Montana gold HP Powder : 9.3gr Longshot Primer : WLP OAL : 1.26 Firearm: Glock 20 There is no glock "smile" but I have questions about the primer. Does this look right? 
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Hard to tell from picture. What do you think is wrong?
Take another picture in a really bright light and set the brass down. Slow shutter speed and a shaky hand makes bad pictures. If I had to guess you are concerned about the firing pin / striker drag mark? Just get a stronger recoil spring. At least 22 pounds or just get a 24 pounder. |
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Load and primer look fine.
Typical glock firing pin strike with a slightly added pin drag. If it bothers you, polish up your firing pin with 1200 sandpaper under a optivisor to knock off any burrs. Check the length of your firing pin to insure it is not to long. You can not retard the unlock time of the pistol by increasing the recoil spring. The only thing a heavy than standard recoil spring will do is speed the cycle time, put the pistol into a nose dive on return to battery making follow up shots low, in most cases incress precived recoil and beat the pistol up more than a lighter recoil spring. That's why the big boys at IDPA run as low as they can go to still get a reliable feed. Some guys run as low as 8lbs springs in there open 1911's. Down side is your waiting on the gun to cycle when running fast, but the unlock timing is not effected, just the total cycle time is. The primary function of the recoil spring is to return the slide to its battery position while stripping a cartridge from the magazine, an thing thing else is consequential. In fact, you can fire the pistol without one. Since the unlock timming is a predetermined mechanical relationship of barrel and slide mass, the only thing you can do to retard the unlock timming is add mass to the slide. Being unpractical about bolting on a unsightly hunk of steel to your slide if the slight drag irritates you, the simplist, cheap and most effective remedie is simply install an extra power striker spring. Good luck and enjoy those 10mm loads. |
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Think I found the sweet spot today.
10gr of longshot is producing a very accurate load with no pressure signs but a snappy recoil and really hitting the steel with a twang. One note. I now understand why this powder is sometimes referred to as "Loudshot" Holy cripe it's got a boom to it. I have GOT to invest in a chrono... |
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Quoted:
Load and primer look fine. Typical glock firing pin strike with a slightly added pin drag. If it bothers you, polish up your firing pin with 1200 sandpaper under a optivisor to knock off any burrs. Check the length of your firing pin to insure it is not to long. You can not retard the unlock time of the pistol by increasing the recoil spring. The only thing a heavy than standard recoil spring will do is speed the cycle time, put the pistol into a nose dive on return to battery making follow up shots low, in most cases incress precived recoil and beat the pistol up more than a lighter recoil spring. That's why the big boys at IDPA run as low as they can go to still get a reliable feed. Some guys run as low as 8lbs springs in there open 1911's. Down side is your waiting on the gun to cycle when running fast, but the unlock timing is not effected, just the total cycle time is. The primary function of the recoil spring is to return the slide to its battery position while stripping a cartridge from the magazine, an thing thing else is consequential. In fact, you can fire the pistol without one. Since the unlock timming is a predetermined mechanical relationship of barrel and slide mass, the only thing you can do to retard the unlock timming is add mass to the slide. Being unpractical about bolting on a unsightly hunk of steel to your slide if the slight drag irritates you, the simplist, cheap and most effective remedie is simply install an extra power striker spring. Good luck and enjoy those 10mm loads. GUN DIGEST BOOK OF THE 1911 Read the second column. He says if you have a strong load and a week spring you get a drag mark on the primer. 
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How well does Longshot meter? I'm getting sick of hand weighing 800X.
10.0 is definitely at the high end for Longshot. I have a spreadsheet of 10mm factory pulldown data from 10mm-firearms.com, and according to it, Underwood puts 10.2gr under a plated/TMJ 165gr bullet, and 10.8gr under a 165gr Gold Dot, but I obviously can't speak for the validity of those. Your primers look fine to me, BTW |
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Quoted:
Just a load update. 10gr of Longshot is producing 1400fps with a 165gr JHP out of a G20. I think this is about as hot as I can push it without running into pressure problems. Thoughts? I've taken 180 gr FMJ to 10gr of Longshot.... your load looks fine OP. |
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