I have a .450 Ackley that I am thinking about making a .450 Dakota or Rigby out of. Will the reamer of either cut out all of the old chamber or will I have to set the barrel back?

Thanks,
Telly

Base to shoulder lengths of the three from my specs at hand, trust but verify:

450 Ackley Magnum: 2.360"
450 Rigby Rimless Magnum: 2.345"
450 Dakota: 2.324"

Yes, you ought to set the barrel back, to surely clean it up, but only one thread ought to do it if it is a 12 TPI thread.
Screw it in one more revolution so the sights are timed, and rechamber.

DRG says: "Kiss my liberal grits!"

Thanks RIP. I may just see if I can find a .458 Win or Lott barrel for it (CZ 602) there used to be some take offs posted here in the past.

Telly

quote:

Lott barrel for it (CZ 602) there used to be some take offs posted here in the past

AHR ( http://www.hunting-rifles.com/index.htm ) should have what you're looking for and If you don't/can't do the work yourself, they are FAST and GOOD.