Would you be interested in a .22 Bentz finish reamer? You can borrow this from me for free. I cut one chamber about 10 yrs. ago. It has a floating pilot and made by Dave Manson.https://mansonreamers.com/
If your bbl. won't shoot with a Bentz finisher chamber, well, ..... you may have other issues.
I realize that you have a specific dimensions that you seek - I appreciate that. When I was in competition, I built a specific rifle just for the 1000 yd. Wimbledon match. It had a 1-1/2" Hall action and was chambered for .300 Win. Mag. with tight neck in a Hart bbl. Bedded into a 500.00 McMillan prone stock and a Hart 2 oz. trigger. Total price was about $3500.00. I think the reamer cost about $250.00. Awesome rifle.
When I sold it on GB, it was going out West for an elk gun. It weighed about 17 lbs.
If no one responds to your needs, maybe I can get you there 99% of the way. The price is right - ....free.
This is my way of paying back to the wonderful shooting communitiy.
Packrat1947 In Ohio, ...40 min. from Camp Perry