SPP vs LPP

[Sailormilan2]

SPP/SRP in 10mm brass might prevent cratering. Most 10mms use a 9mm firing pin, and use LPP in the brass. I always get lots of primer cratering, which a smaller primer might prevent. I need to get some SPP 10mm brass and try it.

[baranski]

SPP/SRP in 10mm brass might prevent cratering. Most 10mms use a 9mm firing pin, and use LPP in the brass. I always get lots of primer cratering, which a smaller primer might prevent. I need to get some SPP 10mm brass and try it.

How many you want?😁

[kcstott]

SPP/SRP in 10mm brass might prevent cratering. Most 10mms use a 9mm firing pin, and use LPP in the brass. I always get lots of primer cratering, which a smaller primer might prevent. I need to get some SPP 10mm brass and try it.

To fix primer cratering you need to first address the firing pin hole and chamfer.

[9mmepiphany]

I know it's a hassle sorting for the sizes but not too big a deal. Just wondering if there was a performance difference.

I reload both SPP and LPP .45ACP and while the velocity difference isn't much (if any) there are other differences.

I sort them and will reload whichever is more convenient due to my primer supply When I was running low on SPP for my 9mm, I switched to LPP .45ACP to control usage. When I was able to restock my SPP supply, I could load for my 1911 with SPP to keep from using up my LPP supply.

When loading SPP .45ACP, if a LPP case sneaks in you don't end up with a smashed primer (as you would when a SPP case sneaks into a run of LPP cases). You feel the lack of resistance and pull that case.

It is easier to ignite a SPP than a LPP if you are using a action tuned to that edge. A SPP .45ACP will require a lighter hammer strike in a S&W 625 than a LPP. I even know folks who load .45GAP in their 625 to take advantage of the light strike required and the shorter case when loading with moonclips

[bohoki]

anyone remember domed primers i have never seen any in the wild but i got an old primer arm that has changeable studs for small dome and large dome

my only other experince is i have a very old box of 30 carbine that has them primed with dome shaped primers

[BIGOX]

I have a bunch of primed 30-30 brass with domed primers. They shoot good

[rsrocket1]

I used to reload aluminum 9mm cases and 45ACP SPP cases and save them for when I go out to BLM land. I still picked them up but if I couldn't find all of then, I wouldn't worry about it. I also have a bunch of SPP 10mm cases and load them up for the times if/when I go to a range where they don't let you collect your own brass. Of course, if I know they won't let you collect your own brass, I probably won't give them my business.

To answer your question:
They all go boom and they all chrony the same.

[TAS]

I’m quite familiar with SPP and .45 ACP but who manufactures 10mm with SPP?

[Snoopy47]

While I frequently use rifle primers in pistols I might hesitate to use pistol primers in rifles.

Reason being, the firing pin might puncture the primer and risk getting gasses out of part of the case it was not designed for.

But all in all I've had satisfactory success with the practice. The exception being my Glocks start having failures to fire using rifle primers. So I have to make sure I use them in Glocks I've added a heavier striker spring.

When using Wolf Rifle Primers I can only get them to work in my 1911's where I jacked up the main spring to 22lb.

[Grendel Guy]

PXL_20230706_224939690.jpg Here's pics of both types of primers next to their respective boxes. And regarding pierced primers, happened to me when shooting.40 S&W out of my Para LS Hunter(10mm). My son picked up the empty and said "Dad, you don't want to do that again". I chambered the round and shook the gun pointing downward to make sure the case mouth was against the chamber edge.

[newbie1234]

I reload .45ACP with both SPP and LPP. No difference in performance.

[ar15barrels]

I?m quite familiar with SPP and .45 ACP but who manufactures 10mm with SPP?

Here are a few:

[sirgrumps]

With the exception of 45 and some rifle rounds, the brass/cartridge will only use one or the other.

45acp is a large pistol primer.

Then Satan decided to get into reloading and created 45acp brass that uses small pistol primers.

There is semi-legitimate reason why some 45 ACP were loaded with SPP.

At the time, and it may still be the case, lead free primers we?re only available in SPP.

I believe the primary material in primers is something called lead styphinate(SP?)