Been shooting the 300 WBY forever. I have used it for LR hunting, IBS 1000 BR and "F" class. Also, I am a tinkerer.....I am ALWAYS searching for something better. The end all/be all as far as powders go, for me, is RL 25.....and believe me...I've tried to find something better!!! Works best in every single tube except one, which liked Retumbo. I've shot deer into the xxxx ranges, plinked steel out to a mile, and put a PILE of wood on the wall in competition!!! Now, the lightest bullet I shoot is the 210 VLD Berger on up to the 230 Berger and the 240 SMK. 215 Fed primers for all loads and all tubes/guns.
The guns range from stock guns to tight neck (.330 and .334) reworked Rems to full on custom BAT 1000 yard BR rigs.
Good luck,
Tod