Yes but not without an extractor change. Most go to Sako or M-16 while they are at it. It's just about as cheap, or cheaper, to order a new bolt from PTG and sell yours. The down side is the wait for the PTG bolt. BTW a Dakota rim is .013" bigger than a Ultra Mag (.532 to .545). The Dakota stuff is based off a true .404 Jeffry's case.