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327 Federal Magnum in a Big Boy Steel Carbine. Is a SR hotter than a SP? Any other concerns with substituting? I'll be using H110 powder and Swift 100 grain A Frame Bullets.

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Problem there is getting the sr to seat flush without deepening the pocket & yes it’s hotter but with H110 that’s may be okay.

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No



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Originally Posted by Anteloper
Problem there is getting the sr to seat flush without deepening the pocket & yes it’s hotter but with H110 that’s may be okay.



Are you sure it's hotter? What do you base that on?



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Should not be a problem.


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Originally Posted by jwp475
Originally Posted by Anteloper
Problem there is getting the sr to seat flush without deepening the pocket & yes it’s hotter but with H110 that’s may be okay.



Are you sure it's hotter? What do you base that on?



You’re right it’s an overly general statement based on what would typically be true. No specific primers were mentioned, so all very “general”.

Other problem may be cup thickness causing misfires.

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And I was wrong about depth!

Depth is different in large primers but NOT in small.

With the heavier strike of your big boy this should work more easily than I thought.

Last edited by Anteloper; 04/18/21.
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Originally Posted by Anteloper
Problem there is getting the sr to seat flush without deepening the pocket & yes it’s hotter but with H110 that’s may be okay.


They are dimensionally identical. It’s the large primers that are not.


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Small rifle and small pistol primers are the same height.

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Usual rule of thumb is rifles chambered in pistol cartridges should use pistol primers.However, rifles (carbines,lever or what ever) will usually have enough hammer force to ignite a small rifle primer. Get those rounds mixed into cartridges used in handguns might be troublesome,but not in all cases.

Small rifle primers are the same height as small pistol

Primer Type Height Min Diameter Min
Small Rifle/Pistol 0.1150 0.1745
Large Rifle 0.1230 0.2105
Large Pistol 0.1150 0.2100


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Cup thickness may be an issue in handguns due to lighter firing pin strikes but I think I’ll mess around with this myself.

Certainly will work up from starting loads...

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Great info. Any concerns with the rifle primer being hotter? I don't mind backing off the starting load, but have read that backing off too much can cause safety concerns as well.

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Judging from people using SRP in pistol today because of lack of SPP there is proving to be little to no difference in hotness. Cup thickness is different



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Gonna depend on the specific primer brand & model.

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I am using Remington 7 1/2 Bench Rest. Looking at various data sources, it looks like even with a compressed load, H110 pressure remain well below max, so that offers some margin of safety.

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Originally Posted by PaulBarnard
I am using Remington 7 1/2 Bench Rest. Looking at various data sources, it looks like even with a compressed load, H110 pressure remain well below max, so that offers some margin of safety.


Never ever have air space with H110/296



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Paul,
Several guys in the pistol forum have tried this. Some have been doing it for years. As you may recall, this is not the first shortage so there more experience with this out there than you might expect.

From what I've read, there seem to be few issues with revolvers and if you are really worried in your striker fired guns, just put in a heavier striker spring.

Also I'd star away from the CCI 41's which are specifically made with a heavier cup for use in AR, and CCI 450's which are magnum primers and also have heavier cups.

Standard non-magnum, non-benchrest small rifle primers shouldn't be a problem are seem to be pretty close, if in some cases not identical to small pistol magnum primers.

Overall, I'm in good shape, but have more small pistol magnum than rifle primers than small rifle, so at some point I may experiment going the other direction, but hopefully supplies lines clear up first.


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Upon further research, it appears that in your particular instance you may even be better off. Apparently some .327 Federal Magnum ammunition is intentionally loaded by the factory with small rifle primers.

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Originally Posted by jwp475
Originally Posted by PaulBarnard
I am using Remington 7 1/2 Bench Rest. Looking at various data sources, it looks like even with a compressed load, H110 pressure remain well below max, so that offers some margin of safety.


Never ever have air space with H110/296


The load data shows all H-110 starting loads as non-compressed.

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Very interesting thread ... been wondering about this myself lately although I'm just as worried about running out of small rifle primers these days as I am small pistol. I never thought I would see the day honestly having stockpiled 1000s and 1000s.

But the day has come and I am now rationing myself.


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