I have only ever used Small Rifle Primers in my .30 Cal. for the M1 Carbine. That said I was given a couple packs of Small Rifle Magnum Primers. Can anyone see a down side to using them in the .30 Cal.?

Also was given a brick of Remington Small Rifle Benchrest primers. I plan on using these in the .30 Cal also. Any problems there?

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USMC 69-93 Combat Pistol Inst.

Nothing wrong with using any of these, just do proper load development rather than merely substituting primers unless your present load is a moderate one. If already near max., start with a lower charge and work up. The carbine action is not the same as a strong bolt-action.

Was using 11.5 grains of 2400 with a 110 FMJ bullet.

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USMC 69-93 Combat Pistol Inst.

No problem with using either type. The only difference is that the SR Magnum cup is a little thicker. You might get some misfires due to lessened primer impact sensitivity, but I doubt that will happen. No problem in using your normal load. You might first load 10 empty cases with SRMs. If they all pop, you should be fine to load with the SRMs.

Pretty mild load.

I agree, no problems with either. As a matter of fact those Remington 7 1/2 primers are rated for the .223 like the CCI#41 primers. They are excellent for your 30 Carbine ammo. Without knowing it you got great primers for any rifle with a floating firing pin.

Those Rem primers are available right now on Midway for $110/K.

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Freedom is never free!!
SWCA #3437

Thanks to all who responded. .30 Cal. for the M1 Carbine is all that I reload for rifles.

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USMC 69-93 Combat Pistol Inst.

My issue in reloading .30 Carbine is all the case trimming required, not the primers used.

Any Magnum primer works very well with the ball powders, that can be a little harder to light.

I do use mag primers in my 270 with 4064 and 4350 for best accuracy in some of my "Winter" loads.

I have not had any problems with either of those primers in rifle loads, over the years.

Have fun.

When I started loading for the .30 Carbine I used either 2400 or 4227 with a 110 gr jacketed bullet. Primers were Standard Small Rifle. This was in the mid 70s and if I remember correctly the data came from an old at the time Speer manual. When I started reloading for the carbine after a long lay off
I used up the last of the primers and powder.
When I went out shopping for powder and primers my LGS was out of standard small rifle but had plenty of CCI # 41s. The store was also out of 4227 and 2400 but had plenty of W296. At that point I began using #41 CCI and W296 for the .30 Carbine with H110 as an alternate powder. Right before the pandemic I picked up 6,000 CCI 41s.

I have been following the data from the latest Speer manual using either Hornady of PPU 100gr FMJ , max charge of W296 with CCI#41s with great results.

I have been loading .30 Carbine for over 40 years, mostly using H110 (same as 296) or 2400. I have tried 4227, but you can’t get enough in the case to get GI MV. I once bought an old can of Hodgdon H240 at a gun show cheap. I did not know what it was for, and I couldn’t find much information. I later found out it was surplus military propellant used for loading .30 Carbine. AA #9 also works well, close to H110.

I once got a real deal on pulled GI FMJ .30 Carbine bullets, 5000 for about 3 cents each. I estimate I still have about 2000 remaining. I have used them for other .30 caliber cartridges also - .30-30, .303 Savage, .30 Remington, 7.5x55, .308, and .30-‘06. Great for plinking. I also load light lead bullet loads to use in my Ruger .30 C Blackhawk. Just too much noise and muzzle blast to use GI-level loads in it.