10mm small primer brass...Why?

tlawler · Feb 6, 2021

Doesn’t seem like any logical point to it. Tooling costs seem like it would make producing it not cost effective, unless it’s produced on the same equipment as .40 S&W brass.

First we had to deal with small primer .45ACP getting mixed in with the large primer brass. Not too big of an issue because I’d just give away all my SP .45, just a hassle sorting through it. 10mm is too hard to come by to just give the SP stuff away, so I’ll use it and just keep it segregated during my range trips. And especially now with SPP so much harder to come by than LPP, it just doesn’t make any sense to me.

Ok...rant over. I feel much better now, thank you.

Loyaljeeper · Feb 6, 2021

Call me crazy, but I find the small inconvenience of inspecting brass first worth it for the versatility. If you like 10mm, but can’t find LPP, you can now use small primers such as small rifle or magnum.

tlawler · Feb 6, 2021

Loyaljeeper said:
Call me crazy, but I find the small inconvenience of inspecting brass first worth it for the versatility. If you like 10mm, but can’t find LPP, you can now use small primers such as small rifle or magnum.

Part of the problem is that small pistol primers are even more scarce than large pistol, at least down here in Florida. On armslist and Florida gun trader, there are several ads for people wanting to trade large for small pistol primers and a lot more where they are selling SPP for $200+ per 1K.

I finally located some once fired 10mm brass for a decent price and the guy mentioned that 100 of it was small primer and did I want that too. Beggars can’t be choosers, so I said heck yeah I’d take it. It’s not that big of a deal, but I just like uniformity I suppose.

Sevens · Feb 6, 2021

It’s absolutely logical and makes tremendous sense, it benefits the ammo manufacturer regardless of what the handloader wants or needs.

Quite simply, it allows the ammo manufacturer to standardize to one size of primer: small. It’s exactly why .45 ACP is going this way. .45 began with small when they debuted the not toxic primers, but the idea that an ammo manufacturer could produce nearly all of their product with only one primer size is a great deal for them when we are talking about large scale production.

Side benefit for handloaders — especially handloaders that run the ragged edge or want to tread beyond the ragged edge: 10mm with small primer makes for a stronger, more solid case head with more brass and less cup.

STORMINORMAN · Feb 6, 2021

There's a silver lining for every cloud... If one just knows exactly where to look?

Cheers!

Autonomous · Feb 6, 2021

It's blasphemy!

tlawler · Feb 6, 2021

Sevens said:
Side benefit for handloaders — especially handloaders that run the ragged edge or want to tread beyond the ragged edge: 10mm with small primer makes for a stronger, more solid case head with more brass and less cup.

That part makes sense. One of my concerns was that there wouldn’t be enough priming compound for reliable ignition with a SPP. There certainly must be a limit to reliable ignition vs. case size, or does it matter? Perhaps once the powder nearest the primer flashes off, the remainder of powder is set off by sympathetic detonation. Would a .44 mag or .500 mag even work if it only had a small primer pocket?

GypsmJim · Feb 6, 2021

For me its no problem. All my rounds are stored in 50 or 100 round plastic boxes. So, I have zero sorting to do. I was happy when I found a huge supply of SPP 45 ACP. I threw out all the LPP brass I had.

When I get primers, I usually find both in stock, not one or the other. If I could standardize everything on the SPP, I'd be happy and just buy a whole lot more.

Sevens · Feb 6, 2021

I have no doubt it will work with the small size — almost with no limit. And if there is a limitation in fire/flammability with a small primer, you can go to a small rifle primer.

For thought, the .223/5.56 is running 60k psi and 22-27 grains of powder with a small rifle primer. And while .357 Magnum entered the world with a large pistol primer, that idea was retired very very early for a small pistol primer, and runs a max pressure and powder charge weight that runs right along with the 10mm cartridge.

If I have to guess, the ONLY reason that small and large pistol primers both exist is because the larger primer was required for more flame a hundred years ago, and with modern primers, it doesn’t matter.

Another thing to consider is that the manufacturers do an absurd volume of testing and they may also have a larger flash hole for the small primer brass than they use for the large primer brass.

Erocksmash · Feb 6, 2021

Its a huge inconvenience, and I agree, WHY? I get it i didn't prep im a new handloader and I dident see the **** coming, why I just got 1k lpp Starline, should last a while... I've got plenty of LPP but am running significantly low on SPP, so why bother?!?! Its not about the little guy any more Sevens is correct.... it sucks but I think we will see everything switch to SPP and the large will be a thing of the past...

Sevens · Feb 6, 2021

Well it never was about the little guy. The ammo companies aren’t building their revenue plan around handloaders.

Only the powder and bullet makers are specifically catering to handloaders. The ammo companies are not catering to the (relatively) small group of us who would much rather stuff our own than buy ammo from them.

Mike SC Hunter · Feb 6, 2021

My 45acp SP brass went into the brass recycle box. Was prepping some 7.62x39. Discovered Hornady has gone to SR in their 7.62x39. May chunk those too.

oldman10mm · Feb 6, 2021

tlawler said:
One of my concerns was that there wouldn’t be enough priming compound for reliable ignition with a SPP. There certainly must be a limit to reliable ignition vs. case size, or does it matter?

Small pistol primers are used in 357 Magnum which has more powder than 10mm.

surfgun · Feb 6, 2021

So who is making this SPP 10mm brass?

Erocksmash · Feb 6, 2021

What I've read here in the forum is, the LPP was utilized for a more uniform burn!?!?

tlawler · Feb 6, 2021

surfgun said:
So who is making this SPP 10mm brass?

The first ones I noticed were Blazer. I got about 10 of them in an order of 600 once fired that I bought. This latest batch, the guy separated the SPP out for me and I’m seeing a mix of Blazer and “Fed”, which I’m assuming is Federal.

M29since14 · Feb 6, 2021

I have not yet seen 10mm with a small primer pocket, but remember, 454 Casull used to get loaded with small rifle primers. Given that, I don’t see how a small-size primer of the right type will have any trouble setting off a piddly little 10mm. Likely a non-issue. Getting primers is THE issue for most folks right now.

tlawler · Feb 6, 2021

M29since14 said:
Getting primers is THE issue for most folks right now.

Man, ain’t that the truth!

oldman10mm · Feb 6, 2021

My 'stash' of 10mm brass, accumulated over about 30 years, couple packs in there are new primed Winchester brass.
Also got just under 300rds loaded.

Autonomous · Feb 6, 2021

GypsmJim said:
I was happy when I found a huge supply of SPP 45 ACP. I threw out all the LPP brass I had.

Are you left handed too?

10mm small primer brass...Why?

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