Mosin Nagant 91/30 re barrel to 450Marlin walk through

[emerson]

I have a friend who is a professional machinist.
Let me see if I understand the process:
-Buy barrel blank of length desired short chambered
Plus reamer and headspace gauge
-thread barrel to match receiver thread and crown muzzle
-screw barrel into receiver and check headspace, reaming
and checking until bolt closes on gauge

Mill reciever opening on the bottom long enough for loaded
round to move up to chamber and slope/bevel/polish feed ramp
until it works.

Then mag well cut outs at front of magwell sides and probably a
spacer on the front wall to ensure rounds don't migrate
forward under recoil.

Please point out steps and nomenclature that I have missed
or messed up. Thanks. I know there are other forums that
cover this stuff too, but I can't always access them from
where I am at the moment.

 

[mg4201]

I have a friend who is a professional machinist.
Let me see if I understand the process:
-Buy barrel blank of length desired short chambered
Plus reamer and headspace gauge
-thread barrel to match receiver thread and crown muzzle
-screw barrel into receiver and check headspace, reaming
and checking until bolt closes on gauge

Mill reciever opening on the bottom long enough for loaded
round to move up to chamber and slope/bevel/polish feed ramp
until it works.

Then mag well cut outs at front of magwell sides and probably a
spacer on the front wall to ensure rounds don't migrate
forward under recoil.

Please point out steps and nomenclature that I have missed
or messed up. Thanks. I know there are other forums that
cover this stuff too, but I can't always access them from
where I am at the moment.

did you sign up at weapons guild like I suggested?. the guy who did it over there will be your best source, he answered all the questions that people posted.

 

[emerson]

did you sign up at weapons guild like I suggested?. the guy who did it over there will be your best source, he answered all the questions that people posted.

Yep, I did. In camp here some sites are harder to get to
than others, but I will ask over there too when I can.
I'm new to these jobs and trying to gather as much info
as possible to understand the process.

 

[tiriaq]

zebdeming's method for altering the magazine is clever. I happen to have a MN receiver plus some other bits, and a .458x2" reamer. If I ever get caught up on current projects, this might be an interesting one.
The .458x2" reamer was bought for a Ruger 77 short action conversion. Haven't finished that one yet.

 

[mg4201]

Tiriaq seems to know what is going on with this, and has done similar things in the past, I would follow his lead. I planned to do this project myself, but itkeeps getting shoved to the back of the shelf.