Small magnum pistol primers

[OleEd]

Bought the above during the drought on primers. I reload and use magnum primers with the 357 loads. Can these small mag primers be used instead of regular primers like in 38, 45 colt?

 

[Englishmn]

Yes, they may increase pressure.
If you are running hot may want to back off powder a bit.

 

[1-cavediver]

My short answer is yes, I do it all the time. Here is a very good article on the subject:

 

[FROGO207]

They will work with adjustments to your load as above. Also what you have for a firearm might make a difference. I have a couple striker fired pistols that dont have the oomph to set of mag pistol primers or rifle primers. Otherwise I have transitioned to using SRP in most anything that uses small sized primers after working up safe loads. If you do this research about it and proceed with caution.

 

[Palladan44]

There is 45 colt cases with small primer pockets? I must be living under my rock again....

But yes, back off about .1 grains of your regular load in standard pistol loads is the consensus on using SPMs in place of SPPs.

Revolvers have a nice amount of firing pin inertia to indent the slightly thicker primer cup metal. Now in striker fired autos is where I might have a slight concern, but again that would probably still be fine, although I've never had to try it.......not yet anyways.

I would not use lesser primers in bigger cartridges......like SPPs in place of SRPs is a no-no. I also don't want to use only SPPs in place of SPMs with something like H-110 or W-296 either.

I'm thinking you can use CCI SPMs in place of SRPs. I've read they are the exact same thing, or close enough to not have a difference. But again if this were true, then why wouldn't the company just indicate that to us consumers making their product more versatile and simplify the whole process? WW sells them separately and since WW has LPP and LPM in the same product, then their SPMs and SRPs are probably different.

If you experiment outside of published data, always start at the LIGHTEST published starting charge you can find out there.

 

[dcarr]

I use srp in place of spp in 38 spl , .357 and .45 acp 100%. Slow and careful workup as others have mentioned.
Have so far not run across a .45 Long Colt with small pocket if there is such a thing. IF it shows up I will certainly try srp in it.
If I put srp in 9mm I can almost guarantee my s&w mp 2 will not ignite it. I can take that same 9mm and fire it ok in 9mm cyclinder in blackhawk
I use small magnum primers in place of spp ,srp everywhere noted above

 

[JKP]

I used SMP, SRP, and even SMR primers in my pistols when primers were more scarce. I did work up the load, but I couldn't tell any difference even when I shot through my crono. The SMR have a thicker cup so I would get an occasional light strike in my hammer fired pistols. 1 striker fired pistol wouldn't light them up at all.

 

[.308 Norma]

Bought the above during the drought on primers. I reload and use magnum primers with the 357 loads. Can these small mag primers be used instead of regular primers like in 38, 45 colt?

As I've posted before, like many here (I suspect) my first handloads were 38 Specials, and soon after that, 357 Magnums. That was back in the '70s, and CCI small pistol primers were $1.00 a box (of 100) around here, while CCI small pistol magnum primers were only $1.10 (only a dime more) a box.
So, I just used magnum primers in both 38 Specials and 357 Magnums. A dime a box (.1 cent a primer) wasn't worth the hassle of worrying about what primers I'd installed in a batch of cases last night or last week.

 

[OleEd]

Thanks all will rework my recipes. And sirs, I meant 45 acp. I have about 500 45 acp brass with small primers. Being totally retired I have the time and I like to reload with handguns and rifles. I load for my son so I make a fair bit of rounds.
Thanks again. OleEd