Thread: Flat Primers
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Old 09-24-2018, 12:45 PM
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ArchAngelCD ArchAngelCD is offline
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Like I said in my first post, primers are not a good indicator of high pressure in handgun ammo, especially since the OP is Bellingham there was no sticky extraction.

I can tell you, when I was shooting factory ammo all the 158gr Winchester .357 Magnum ammo I shot had primers which were flatter than those. If the only indicator you are seeing are the flattened primers I wouldn't worry.I

Edit:
Here are some new max book loads with 2400
Speer #15
158gr Speer GDHP 14.8gr @ 1265 fps 10" barrel
Hornady #10
158gr Hornady XTP 14.3gr @ 1200 fps 10.5" barrel
Nosler #8
158gr Nosler JHP 12.3gr @ 1520 fps 8.3" barrel ( I DON'T SEE HOW THIS VELOCITY IS POSSIBLE)
Lyman #50
158gr Hornady JHP 14.9gr @ 1279 fps 4" barrel
Alliant Online Data
158gr Speer GDHP 14.8gr @ 1265 fps 10" barrel

It looks like all the sources but Nosler agree on the max charge and velocities with a 158gr jacketed bullet and 2400. Older sources have even higher charge weights. I would say 14.8/14.9gr is a safe and charge especially since that's what the powder manufacture is telling us.
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Last edited by ArchAngelCD; 09-24-2018 at 01:11 PM. Reason: To add data
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