Primer question

Bristol Mt.Man · May 30, 2020

OK guys, I have almost a 1000 CCI 450, small rifle magnum primers and am thinking of using them in 357 magnum pistol rounds. I would use H110 or IMR4227 powder with 155 gr cast bullets with gas checks. Is this dangerous? Could I have a "catastrophic malfunction?" Somewhere I read to start with a slightly reduced powder charge, say 5%. I can't find CCI 550 mag primers anywhere. Any thoughts. Thanks.

Blue68f100 · May 30, 2020

You should be fine. As long as you start low and work up. H110/W296 you should only reduce 3% off max.

If you have a reduced hammer pull on your gun you may run into problems setting them off.

Englishmn · May 30, 2020

If the gun will set them off should be no problem.
I think they sat a little deeper in the primer pocket the time I used them.

AJC1 · May 30, 2020

They will not seat as deep, and will have hard cups. You may be ok but the right tool for the job is always best.

Reloadron · May 30, 2020

Bristol Mt.Man said:
Is this dangerous? Could I have a "catastrophic malfunction?"

No, nothing that drastic. Load a few (my "few" is 12 or 18) and see how it goes. Matter of fact just prime a few empty cases to make sure they go bang. Then work up a load assuming they ignite and shoot fine.

Ron

Bristol Mt.Man · May 30, 2020

Thanks guys, I appreciate it.

243winxb · May 30, 2020

When the output of the primer is to high, the bullet may move to soon. This may result in a secondary pressure spike.

If bullets move too soon, H110 may not burn correctly. Squib. :evil:

I think it will be fine.

Bristol Mt.Man · Jun 1, 2020

Just got home from the range and no misfires or surprises.

Primer question

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Reloadron

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243winxb

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