WB
You really do need it professionally done.
Sunday, July 23, 2017, 11:14

Someone needs to have a "rougher" reamer to get it mostly opened up to dimensions. Close counts with their use. This takes a lot of wear off the "finisher" reamer. One could use a finisher but it sure would put a lot of wear on the tool. You'd have to stop and clean it a bazillion times and keep it from getting too hot. That's really too much metal to remove in one pass and ensure a clean final chamber to specs. Every time a reamer is used it is a teeny tiny smaller for the next "hole", until it's out of spec.

It seems a simple thing to do but it's more complex than one may think. If you can find a .22 LR or WMR tube for less than say $200 it would still be worth it.

The old 10" octagon barrels are of a special liking to me.