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I've used Reamer rentals and that works well.
HOWEVER you don't want to use a chamber reamer to change/lenghten the throat in your rifle. Messing in that chamber with a chamber reamer will require headspace adjustment.
You're looking for a throating reamer, but you need to be very careful to not go to far, and to be sure the thing is lined up properly or you'll have a gawdawful mess when you get thru.