Yes one more 300 blackout question

[nagantguy]

Who among you uses small mag rifle primers and who uses standard small rifle primes; in a AR platform? I've only been using small rifle with both cast and jacketed cause I didn't know some such as Hogddon recommend the mag primers! Other sources say only the military primers others say standard small rifle, so who's using what and do you believe the standard small rifle poses any risk?

[curator]

Having been reloading for my AR 15 platforms for a couple of decades, I am not worried about using SRPs for 5.56 NATO or .300AAC. I realize that many reloaders ONLY use Mil-Spec primers due to the "possibility" of slam-fires. My ARs all have light-weight titanium firing pins so I have less concerns about that. Live chambered then extracted rounds show no dent in primers. (Unlike my M1A) I have used both CCI and Winchester small rifle magnum primers when loading H110 powder or AA#9. This seems to give smaller velocity variance compared to SRPs and is what the powder manufacturers recommends. Otherwise, Winchester, Remington, CCI, Federal small rifle primers work OK. Check to see if your chambered live rounds show any dent. If they do, you might want to use "mil-spec" primers.

[rda72927]

I just avoid the possible issue and use CCI 41's...

[nagantguy]

No no dents, no wild deviation in fps,fairly clean brass and rifle so I guess I'm not doing it "wrong"

[Electric88]

I've used regular old small rifle primers in both 223 and 300blk for ARs and haven't had slam fire problems. I think you'll be fine with them.

[sundog]

I just avoid the possible issue and use CCI 41's...

Excellent choice. I do the same.

[popper]

Standard CCI in ar10 & BO. Get a few light dings but no mis/slam fires.

[Boolit_Head]

You see a lot of wanna be operators frothing at the mouth over anything "Mil Spec". Problem is that term in general is not very defined and really not a applicable term in general. Most don't even know what it means, they just want Mil Spec.

In 30 years of messing with AR's I've yet to see a actual dent on a primer after cambering or a slam fire with commercial primers. I have seen marks that show it touched but not enough to move the surface of the primer. Now I am sure under certain conditions it may be possible but the likelihood is low. As long as the primer is seated properly the chance of issues is low. Obviously safety rules are still good to observe and cambering with the muzzle in a safe direction is always a good idea.

[nagantguy]

You see a lot of wanna be operators frothing at the mouth over anything "Mil Spec". Problem is that term in general is not very defined and really not a applicable term in general. Most don't even know what it means, they just want Mil Spec.

In 30 years of messing with AR's I've yet to see a actual dent on a primer after cambering or a slam fire with commercial primers. I have seen marks that show it touched but not enough to move the surface of the primer. Now I am sure under certain conditions it may be possible but the likelihood is low. As long as the primer is seated properly the chance of issues is low. Obviously safety rules are still good to observe and cambering with the muzzle in a safe direction is always a good idea.

This also seems to be take and experience, not knocking anyone else or how they do it but since 1994 I've had at least one ar type weapon, the Corps did school me well on such platform I haven't had any issues with my loads and standard small rifle primers and except the dreaded slam fire I haven't seen nor read anything concrete enough to lead me to believe my small rifle non magnum primers aren't appropriate for the task. Thank you everyone for your time and feed back!

[Moonie]

I've always used standard rifle primers for my AR rounds, .223/5.56, 300BO, 6.8 and 6.5.

[Texas by God]

Standard. No problems IME.

[Elkins45]

Standard. No problems IME.

Same here.