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Old 01-30-2014, 9:55 PM
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Default Small Pistol Magnum Primers vs Small Rifle Primers

Can Magnum small pistol primers be used in place of small rifle primers in a .223?

Just curious...
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Old 01-30-2014, 10:18 PM
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I think the cups are to soft and will not hold up. Pressure in a .223 round is 10 to 20k psi more than say a .357
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Old 01-30-2014, 10:41 PM
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What he said. But hey, try a few and tell us how it works out...
`Twas brillig, and the slithy toves...

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Old 01-31-2014, 12:55 PM
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Bad idea. The 223 works at a higher pressure.
A 30cal will reach out and touch them. A 50cal will kick their butt.
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Old 01-31-2014, 1:02 PM
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Also, my understanding is that rifle primers are harder because many rifles have free floating firing pins. Soft primers in an AR platform can cause a slam fire. You don't want that.
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Old 01-31-2014, 5:46 PM
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Default On the other hand...

Ima gunna walk on the thread .. ooops

I use Small Rifle Primers in my .45ACP sm primer cases. CCI#400s to be specific. Worked the load from the bottom and ended up with my usual powder charge without any noticeable difference from my regular LPP .45ACP load.

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OH! and never use SPP in an AR platform. Bad things can hapen like the potential and likely, slam fire

The best thread EVER!

Last edited by livefire; 01-31-2014 at 5:47 PM.. Reason: OP
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Old 01-31-2014, 7:34 PM
Witch Hunter Witch Hunter is offline
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No don't use small pistol in your 223 AR! The AR needs a rifle primer. although they are both the same size, SR primers are thicker to withstand the pressure developed by a rifle. Note, CCI makes the #41 just for these applications where you may get a safe, use the correct components.
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Old 01-31-2014, 8:10 PM
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More pressure on the rifle, bad idea.
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Old 02-01-2014, 8:13 PM
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I have seen numerous threads stating that the CCI 400 and CCI 550 primers are the same per CCI. I saw that some people have used the 400's in place of 550's in 357 magnum rounds. I have not heard the other way around though using 550's in 223 rounds.
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