7.62x39

Ask about your Model 8 & 81
Post Reply
LyingBastard
Posts: 15
Joined: Sat Jul 14, 2018 6:51 am

7.62x39

Post by LyingBastard » Sat Jul 14, 2018 12:46 pm

More as a mental exercise than suggesting it to be done, and ignoring barrel issues for now: would 7.62x39 be a good modern caliber for the 8/81? My argument:
  • Similar to 30-30 in many ways
  • Plenty around though brass casing is not found at Wal Mart
  • Bullet diameter in the 30-32cal range
  • Maybe even the rear of the cartridge is large enough for the bolt to grab
Thoughts?

And, yes, this is on the same lines as the viewtopic.php?f=10&t=5202 thread

User avatar
81police
Posts: 2143
Joined: Thu Feb 05, 2009 12:12 pm
Location: TEXAS

Re: 7.62x39

Post by 81police » Tue Jul 17, 2018 8:39 am

It would be an interesting venture. Key would be having a cartridge to operate below the maximum chamber pressures of the cartridges of the time. You wouldn't want to hot-rod these old actions!

I haven't researched them, but 7.62x39 and 6.8SPC would be cool
Cam Woodall
Site Co-Administrator

LyingBastard
Posts: 15
Joined: Sat Jul 14, 2018 6:51 am

Re: 7.62x39

Post by LyingBastard » Tue Jul 17, 2018 11:26 am

I was looking at some numbers for those cartridges:

Code: Select all

                        30-30 | 30Rem | 7.62x39 vs   32Rem vs 35 Rem
Pressure, CIP Kpsi                      51.5
Pressure, SAAMI Kpsi    42      38      45              36      33.5
OAL in                  ???     2.525   2.205           2.54    2.525
Base Diameter, in       0.422   0.422   0.447           0.418   0.460
Bullet diameter, in     0.308   0.308   0.312           0.321   0.358
If the 30-30win is considered close to the 30Rem as far as powder loadings are concerned, I would think that means the performance is similar. And if people claim the performance of the 7.62x39 is close to the 30-30 (some even say it is a bit below it), it might just work. Being designed for gas operated firearms the 7.62x39 should not have a peaky curve.

I would love to find a hopeless Rem 8/81 barrel so I can use to do some thinking, but if it comes to that I have no issue taking mine apart and measuring it.

LyingBastard
Posts: 15
Joined: Sat Jul 14, 2018 6:51 am

Re: 7.62x39

Post by LyingBastard » Mon Jul 23, 2018 9:48 am

Interesting: I tried to put a 7.62x39 round in the bolt and it acted like it was a bit too fat for it. But this is supposed to be a 35 remington bolt, which according to my little table has larger base/rim diameter than the x39.

I feel rather confused.

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest