Not sure if we're still talking about chamber length but....
Here's some of my max chamber length guages. I cut half the neck with a dremel, debur and chamfer. I ream the cut off piece to about. 001" tension on a bullet.
Seat a bullet in the case.
Chamber and carefully extract, measure and...
My advice is, do not try to make a 6.5 Needmoor a 26 Nosler. Like making a Mazda a Corvette. Lol.
Powders that are too slow for useful barrel burn curves will soot your bore horribly (and cause hard carbon rings) and cause unnecessary muzzle blast and recoil.
The only sensible solution is to...
Tumble your brass in corncob after annealing. The annealing tarnish is very sticky!
The other option is to brush the necks but I would suggest keeping the natural carbon in the necks.
For some reason tumbling in corncob takes the edge off of the annealing tarnish but keeps the carbon layer.
The barrel actually floated during trial fitting pre-bedding. I left two spots of the wood un touched when I ground out for the epoxy, I (installed 3/8 stainless steel tubing for pilars while I was at it.)
I wrapped three wraps of electrical tape around the barrel to center it and to insure...
When I was hunting as kid I used to look up at my Dad carrying his 700 30-06, he was my hero back then.
My chores were to do brass prep so we could load when he got home from work.
When he passed away my brother got his rifle, cut the stock down and rebarrel it for his young kids. A noble thing...
That's the thing, I'm not going to use it.
I don't want to work up a load with something that won't last the barrel life.
I have 7977, 4955, and 8133.
Wish I knew someone who needs them and close enough to trade.
Wish you weren't 3/4 the way across America I'd trade something for some 8133.
8133 came out in the middle of the barrel life of my first 28 Nosler barrel. That barrel is gone and I have pounds left over.
This is the very reason I've stayed clear of every PRC cartridge. Unless you chamber a barrel in an Alex Wheeler reamer your going to have problems.
Makes the 7mm Remington magnum look pretty good.
I spray super77 adhesive on cardboard with cheap tablecloth paper adhered to it. Then put 3/4 orange labels outlined with sharpie and 1" stencil.
I'm pretty particular about my targets, but I'm also cheap. Shows up really good at 200 yards.