Calibers That Accept Small AND Large Primers

[Tennessee Jed]

Recently, while loading 45 acp with large pistol primers, I ran into some cases with small primer pockets. At first it annoyed me, then I realized having both types could make primer buying more easy. Since then, I bought a lot of 45 cases with small primer pockets, and I've been using small primers and large primers for 45 acp, depending on whatever I have the most of.

My question is, are you aware of any other calibers, whether pistol or rifle, that have cases in both primer pocket sizes? I've heard that there are some 10mm small pistol primer brass cases out there, but haven't been able to find any. Thanks.

 

[nofendertom]

Do you use the same loads in SPP .45acp and LPP .45acp?

 

[Tennessee Jed]

I do. Haven't noticed any differences between the two.

 

[Jonny2guns]

I bought some Midway 10mm small primer

 

[Bazoo]

You're thinking is wise.

38 and 357 magnum used to be large primer, but it's been so long none are in circulation. I think the last was in the 60s. I have 6 in 38 special.

30-30 had a bench rest version named 30 American that used small rifle primers. That was during the 80s and the brass has been gone a long time. I've looked for some, a working amount as well as just a single for my collection eludes me.

 

[The Glockodile]

.308 Winchester - regular and Palma.

6.5 CreedMOOR - small rifle primer Lapua (at one point), regular everyone else.

There's a bunch more...

 

[AJC1]

.308 Winchester - regular and Palma.

6.5 CreedMOOR - small rifle primer Lapua (at one point), regular everyone else.

There's a bunch more...

In 308 lapua calls their brass palma, the rest like alphas and Peterson just call it small primer. Be careful with a standard decaping die if you get small primer brass, the firing hole is also smaller.

 

[dh1633pm]

6.8 SPC

 

[greyling22]

7.62x39

 

[Mark_Mark]

10mm

 

[dcloco]

Multiple pistol and rifle calibers do. Depends on the brass manufacturer.

 

[dartor]

I have some 6.5 Creedmoor Federal cases using small primers. I found no difference in my preferred load using them.

 

[BigBlue 94]

6.5 Grendel, though the only large primered ones ive seen are wolf berdan primed steel case.

 

[Show Me]

Snatched up 500 45 acp small primer to relieve the pressure on my LPM supply. Can't tell a diff.

 

[Dudedog]

Do you use the same loads in SPP .45acp and LPP .45acp?

I have found with most of the loads/powders I have used the LPP rounds tend to be 10 to 20fps faster,
but that difference was using S+B primers for both. (S+Bs are no longer around but were "milder" than say CCIs)
A SP .45 with a CCI and a LP with the S+B would probably be so close vel wise you couldn't tell the difference.

Of course if you are loading MAX loads I would work up for each but for things low to midrange I use the same charge for both.

 

[GeoDudeFlorida]

Snatched up 500 45 acp small primer to relieve the pressure on my LPM supply. Can't tell a diff.

The only difference I can tell in S/LPS vs. S/LPM is my old WW-II surplus Remington-Rand won't always set off the magnum primers, small or large, on the first hammer fall. Every other .45 I have will, including the old 1917 S&W. The R-R only misses about 1 out of every 20 magnum primers, esp. CCI, and a second strike will pretty much always go BANG so it's not really a "problem" per se, just an observation.

 

[mdi]

Several years ago I did my own 45 ACP small primer vs large primer test and bought 300 small primed cases. No real difference. The "worst" part is separating brass, but I inspect every case I reload, so the "hard part" is tossing cases into 2 containers rather than just 1...

 

[Carl N. Brown]

More calibers with cartridge cases with either small or large primer pockets ... arrrgh. It aint fun trying to seat a large primer in a small primer pocket.

I have three guns that fire 45 ACP.
One has an off-center firing pin impact; I dare not shoot that gun with .45 ACP cartridges with small primers.
When I retrieve my own large brimer brass at the range, I always seem to get some found range brass with small primers, so sorting 45 brass is mandatory.
Now there are others I have to watch out for?

 

[Show Me]

I got 2400 to take the pressure off SPM. The WW2 surplus has seen its share of primers and is in semi retirement like I'm headed.

 

[jmorris]

The "worst" part is separating brass, but I inspect every case I reload, so the "hard part" is tossing cases into 2 containers rather than just 1...

 

[vongh]

I need some machines like that.

 

[507Reloader]

I need some machines like that.

Get you a simple LEE APP . Deprime 1,000 pistol brass an hour. Best $100 I've ever spent in reloading.

 

[vongh]

Get you a simple LEE APP . Deprime 1,000 pistol brass an hour. Best $100 I've ever spent in reloading.

I'm a machinist. So the Idea making a project and taking raw materials to make a working piece of machinery like that. Really floats my boat.

 

[jmorris]

I need some machines like that.

That one was just playing around with an auto decap machine I made.

This is the one I actually use, it culls cases as I load them vs adding a step.

 

[entropy]

I have several hundred range pickup SP .45 ACP, as well as @400 Blazer aluminum case SP .45 ACP, in addition to the LP I have. I separate the brass SP for from the LP, and obviously the Blazers are separate.
I like it because I have more SP than LP right now, and being winter, I can load the SP up, and fire them without worrying about losing them in the snow; one and done.