Two things. One, Gunnut is right. A Sako extractor is a giant step backward from the Remington design. You especially don't want one in a dangerous game rifle, 'cos if you blow a primer and the extractor goes flying you're stuck with a non functioning rifle. Two, if you are using a scope it will make the ejection straight up and not to the side. I replace quite a few bolts on "tactical" rifles that have Sako extractors because they throw the brass into the scope and back into the action. I go back to a Remington design and lo and behold they work right again! As for bolt availability, Dave Kiff is making them now to your specs as far as bolt diameter to fit your action better. You have to fit them and solder on the handle, but they work great and aren't expensive. BTW, IMHO there are only 2 reasons to put a Sako extractor on a Rem bolt. One is if you're building a PPC and the other is if you have a 721 or other early variant that they don't make extractors for anymore. Past that, leave it alone and it'll work best.