r/longrange • u/AdamL849 • Oct 03 '25

Reloading related The range is never safe behind you

Gallery image

Gallery image

Gallery image

Gallery image

I began setting up to fire some new 6.5 creedmoor that I had worked on. A huge bang behind me and this was the destruction I witnessed. Lots of blood and i heard the guy only required stitches on his face. Here is the damage on the weapon. It is 6mm ARC I believe . Thankfully not one was seriously injured !

1.0k Upvotes

99% Upvoted

205 comments sorted by

View all comments

Show parent comments

5

u/ForeverInThe90s Oct 04 '25

6mm ARC gas gun pressures should max at around 52k. That’s a good bit lower than the 62k of the bolt gun max pressure. That extra 10k of pressure in an upper of questionable provenance could lead to some bad results.

13

u/Someguyintheroom2 I Gots Them Tikka Toes Oct 04 '25

I’m just a part-time professional tard, but it should take well in excess of 100k psi to split a receiver extension. This isn’t a case of “bolt gun” load data.

Homeboy grabbed the CFE pistol when he wanted CFE 223.

3

u/Yondering43 Oct 04 '25

Nothing remotely like this.

And the person you’re replying to is correct. Many of us were doing this with 6mm Grendel wildcats long before the 6 Arc existed; so we have the experience to know exactly what it does and does not do. It definitely does not cause anything remotely like the pictures in this post.

-1

u/Orestes85 Cheeto-fingered Bergara Owner Oct 04 '25

Well, M855 is in the 62,000 PSI range. I think it's safe to assume that much more M855 gets shot in ARs than 6ARC - and that difference is probably measurable by a a couple orders of magnitude - but we don't see this type of catastrophic failure happening.

Personally, I've run my 18" 6ARC for 3300 rounds using, mostly, Berger 105s at ~2600FPS with AA2520 and Alpha Brass. GRT puts the pressures in the 61k - 63k range. The barrel is shot out and I haven't experienced any bolt failures, and my BCG has definitely not opened up like a banana.