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primer suitable substitute

This is a discussion on primer suitable substitute within the Reloading forums, part of the Firearm Forum category; I've only been reloading a little over a year and so far only 38 Special, 357 Mag and 45 ACP. Looking at the dies/supplies etc ...


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Old June 22nd, 2019, 06:55 PM   #1
 
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primer suitable substitute

I've only been reloading a little over a year and so far only 38 Special, 357 Mag and 45 ACP. Looking at the dies/supplies etc needed to expand to 5.56. My Speer book calls for CCI 41 primers but my local store doesn't carry that particular primer.
Is there a cross reference list of what primers are suitable substitutes for other primers?



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Old June 22nd, 2019, 07:08 PM   #2
 
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Look for a Small Rifle Magnum primer like the CCI450. Loads for 5.56mm are loaded to slightly higher pressures than .223 Rem. Some SR primers with (relatively) thin primer cups are prone to piercing when loaded to higher pressures, and are also more susceptible to slam-fires in rifles with free-floating firing pins like the AR-15.

And to answer your question, your reloading manual(s) should have a cross-reference list for primers.
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Old June 22nd, 2019, 08:05 PM   #3
 
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For the AR15 any primer with a cup thickness of .025 will work fine, with thinner cups the risk of a slam-fire increases. The greatest risk of a slam-fire is if a single round is loaded WITHOUT the magazine in place and the bolt is allowed to slam shut. With the magazine in place the bolt speed is reduced as it picks up a round and feeds it into the chamber.

Here are some primers with a .025 cup thickness;

CCI BR4

Magtech PR-SR

Remington 7 1/2

Wolf SRM, (Small Rifle Magnum)

Wolf SR223, (Small Rifle 223)

If I were going to use any of these primers as a sub, I would reduce the charge to the minimum and work my way up loading 3 at a time and look for any signs of over pressure. Some may not be comfortable doing this, but this is my approach when ever I sub out a primer.
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Old July 2nd, 2019, 04:46 PM   #4
 
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Quote:
Look for a Small Rifle Magnum primer like the CCI450.

+1 ^^^^^^^^

That's my answer exactly.
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