How ?..............It's a very simple thing to do on the M70 or at least on mine. It's an EW as well. Mine is 264WM as stated previously but rebarreled in 8 twist w/ 0.165 freebore. When the Berger 156 came out is when I did mine. I needed the room for powder to make it effective. Some factory rifles can be a pain to do this but not this model. Went from 3.4 to 3.6 mag box. I like .025 off lands but I do own several more rifles that have to jump a lot that are shooters but not like this one. It was my personnal challenge and it worked and I'm happy it did
Brownells has this in stock :
Precision stamped, stainless steel magazine box has .110" additional length to provide the required clearance for extra long rounds. Extended box has ...