Flattened primers with 357 rifle

[jkoper]

I recently picked up a rossi 92 in 357 magnum. The load I am using is a lee 358-158-RF cast in 16:1 lead/tin alloy JPW/LLA tumble lube sized to .358
13 grains of Ramshot Enforcer
1.575 OAL
Win magnum primer
Vel. 1600 fps

I'm getting flattened primers, is this a pressure issue or could it be a headspace problem?


Thanks
Jim

[runfiverun]

the 357 headspaces on the rim,flattened primers aren't really a good indicater here.
now if you had flow into the firing pin hole that would be excessive.
i'd say you are running more than 30-k though

[NSP64]

Post a pic
Might not be flattened
I think flattened is there is just a line around where the primer and case meet, flat all across except for the firing pin dent.

[Blammer]

I'd suspect pressure.

Try less powder or try a diff powder.

[1Shirt]

I would agree with Blammer. I have had best luck with H-110 and 2400 in my 94 Win 357.
1Shirt!