7.62x54R to 7.62x39 bolt face modification

[civilian75]

I want to build or modify a subsonic rig on the cheap. The easiest route to go would probably be to buy a 308 Rem 770 or a Savage 111 (still need to confirm if avaiable in 1:10 twist rate).

But I alreay have seveal Mosin Nagant platforms with 1:8-ish twist rates, which is best for them slooow moving rounds. The problem is developing a safe load for the humonguous Russian case. I would rather use the x39 Soviet case.

It is not unthinkable to get a chamger adapter. I will try with the guy in Alaska. But, the extraction and ejection issue remains unresolved.

Has anyone worked out a modification to the M/N bolt face and extractor pin? What have you done about the ejector?

 

[rcmodel]

The easiest route to go would probably be to buy a 308 Rem 770 or a Savage 111

I don't know if that would work either.

The .308 case rim / bolt face is .473".

The 7.62x39 is .447".

rc

 

[civilian75]

Agreed. at least it is not as bad as the 0.570" of the 7.62x54R. Other folks seem to have been able to successfully modify their 308's.

Whatever route I follow, I suspect it will involve some welding and machining. I am sure I am not the first who thought of it and did something about it.