Gunsmithing Need M70 box mag part advice

Surffshr

Beach Bum
Full Member
Minuteman
Jan 9, 2009
369
3
SoTX
The rifle is a M70 CRF in 300wm. I had the action trued and custom barrel installed, but retained the factory box mag and follower. My load with the A-max and other high bc bullets won't fit in the mag and I'd like to know what my options are to maximize OAL. Appreciate any advice you can provide.
 
Re: Need M70 box mag part advice

http://www.wyattsoutdoor.com/

http://www.brownells.com/.aspx/pid=1405/Product/EXTENDED_MAGAZINE_BOX

EXTENDED MAGAZINE BOX

* Mfr:WYATT'S OUTDOOR
* Price:$42.50 - $67.76
* Made in the U.S.A.
* Extra Length For Ultra Mag & .404-Based Cartridges

Precision stamped, stainless steel magazine box has .110" additional length to provide the required clearance for extra long rounds. Extended box and Long Window box have plenty of room for the popular .300 and .338 Ultra Mag and other calibers based on the .404 Jeffery case. Extra-long feed lips give reliable feeding with .284 Win. cases. Long and Short Window boxes have a triangular window that provides extra room for case shoulder; holds three rounds of these large diameter cases.

M-70 fits Winchester Model 70; increases magazine length from 3.4" to 3.82". Requires machining receiver and altering bolt stop and ejector.

SPECS: Stainless steel. Capacity: M-70 3.82" (9.7cm) long, fits Winchester Model 70 long action. Capacity three rounds.
 
Re: Need M70 box mag part advice

WSM chambered rifles are an In-Between receiver design.

I'm thinking the Wyatt's box is for long-action magnum cartridges and is too long for a WSM or WSSM chambered receiver. If the rifle was a long-action conversion; no problem, but if not....

I have converted Winchester mag boxes and bolt stop to allow longer bolt throw and longer oal bullet seating. If your WSM magazine box has a spacer, that is your easiest solution. If you had a WSSM box of course you could just swap the WSM box and bolt stop.

Look at your receiver removed from the stock and measure the box recess. Doubt you have 3.82" oal to work with.

Wish you good luck!

Can always simply add a sled follower and chamber single rounds.

Also might think of a heavier profile bullet than a VLD design. The 185 Berger in a .30 would probably out-perform any of the 175 VLDs at longrange. Sometimes you just need to rethink the variables rather than spend money on gunsmithing...