M70 project

gebudjr

gebudjr

New member
to those who may have done this,,,

I have a complete standard action M70 in 270 win, I would like to build a custom sporter in a magnum chambering based on the H&H case. Will this action work if I obtain a magnum bolt shroud? I will be using the existing firing pin assm. Thanks.
 
There are several versions of the Model 70 action, not sure what you are calling a "standard." If you mean a long action, pre or post 64; yes it will work. You will need a magnum bolt face {entire bolt body}, not the shroud. The shroud as I know it is the "striker housing" that has the side swing safety attached to it and unscrews from the back of the bolt with the striker and spring.
 
My son had a 300 H&H built on a 7 Rem. Mag. M70 Classic. The smith shortened the bolt stop, put in a different magazine box and milled the action port a bit longer. It's tight but works fine.
 
The problem you have with that model 70 is the bolt face is for a .270 and not an H&H mag case.

I own a 700 Classic in .300 H&H and it is a neat cartridge. Unfortunately I no longer hunt with it and hasn't even been fired in 10 years. I keep fighting the urge to sell it but will probably give in one day.
 
ok thanks, I want to say that winchester offered a magnum and a standard acitoin (LA). having said that your thought on this conversion?
 
You have a standard action if it’s a 270. These were the parameters I entered into ammoguide:

270Conversion.jpg


I got the results and you have 175 options (different calibers) to choose from. NOT ONE WAS an H&H.

So I changed the parameters to this (NOTE: You have to modify the bolt face as you stated you’ll do)

270Conversion_2.png


And the answer is YES!!!

270Conversion_1.png
 
308 Norma mag case

Parent case .338 Winchester Magnum
Case type Rimless, Belted
Bullet diameter .308 in (7.8 mm)
Neck diameter .340 in (8.6 mm)
Shoulder diameter .489 in (12.4 mm)
Base diameter .512 in (13.0 mm)
Rim diameter .530 in (13.5 mm)
Rim thickness .048 in (1.2 mm)
Case length 2.56 in (65 mm)
Overall length 3.30 in (84 mm)
Primer type large rifle magnum
Maximum pressure 55,100 psi (380 MPa)
 
KOOL! I thank your for the research, I will have to look up that website and bookmark, thanks agaian Carcass Collector!
 
After reading this thread I just now tried to put a 300 H&H Magnum loaded round into my Win M70 post 64 in 270 Win. It is to long. The 300 round is loaded with a 165 grain core-loct (not a particularly long bullet) yet the magazine is not long enough by around 3/8th of a inch. Sorry.
 


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