Unless you want to pull the barrel it would be easier to cut the chamber by hand. This used to be a popular wildcat and the 8mm/06 performs very well. Reamers can be rented from White Rock Tool in Mo, for around $40 so you do not have to buy one. Last I knew they had 8mm/06 on the list. I have done a few of these and the chamber is no problem nor is finding loading info, have at it and have fun.