I've been using RL26 now for about two months and found a great shooting load with 162gr A-Max bullet. 71gr RL26 from Alliant website and CCI 250 primer and of course WW brass.
You're going to have to buy factory ammo for the brass. Who knows when Winchester will make another run of 7mm WSM brass, if ever. Still a mass brass shortage in general up here.
I'm shooting the 200gr Barnes LRX bullet with RL25 in my 300 RUM with a Barnes manual max load of 88 grains. The Hornady manual shows the 220gr bullet with 92.5gr as a max load.
I have no chronograph as of yet, but here soon in the spring. Am I on the slow side with 88gr?
New to the site and liking it. Lots of info to be had here. Anyone here have any luck with the 300 RUM and the 200gr Barnes LRX bullet with RL25 powder?