re-barrel win m70 to new caliber

Discussion in 'Gunsmithing Forum' started by lll308, Jan 9, 2011.

  1. lll308

    lll308 New Member

    I have a m70 .308,I changed the barrel to 220 swift,everything works except the magazine,it will cycle ok if only one shell in magazine,if 2 shells are in,it will not pick up the shell,what modification is neccessary for it to cycle with more than one in mag..lll308
  2. stalkingbear

    stalkingbear Well-Known Member

    The problem you're having is probably due to the .220 being a rimmed round whereas the .308 is a rimless round. You'll need to modify the magazine box feed lips and/or the follower. I'd recommend you let your gunsmith figure it out. I forget what the formula is for magazine box width but I believe it's 1.6 x cartridge diameter.