I used Win 300wsm brass for my first 7wsm, I found Norma 270wsm for my second 7wsm.
It sucks, it makes the 7wsm short neck even shorter when it's all done. But at least I have brass.
A couple of years ago Hornady made a batch of 7wsm.... I'm not doing Hornady for anything.
I think you can relax.
If you follow the condensation trails they go from one airport to another airport.
Because many flights go from one to another multiple times a day and the wind is moving them in a certain direction. That's the uniform patern.
Congratulations! Don't know where you hunt in SE TN but I got this buck in Hardin county last night.
Thread '165gr Ballistic tips!!' https://forum.nosler.com/threads/165gr-ballistic-tips.46519/
Got outstanding performance in my 300wm this evening! 275 yards in the elbow crease.
77gr Reloder 23 at 3300fps.
I was very scared this load was too fast for a light bullet for whitetail. But he hit the dirt hard, no unnecessary meat damage.
I try to use 180 to 215gr out of my 300win mags...
Yotes on my property either intentionally get sprayed or kill skunks and roll in their stink!!!!!!!!!!!!!!!!!!!
To throw off their own scent. I can smell them coming.
Except 7.62 51 probably doesn't get gm215m, CCI250, Rem 8 1/2 or WLRM primers.
I didn't know where they went, maybe their efforts are all on non magnum large rifle manufacturing.
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.