I need advice on the newer powders. I've always been a 4831, 4350, 30-31, 4064, BLC-2, R15 shooter in my various rifles. H4831 and H 4350 were the go-to powders when I got my 300 Wby 54 years ago.

I'll be shooting 165gr Hornady BTSP. What stretches my Bee out best that's available now?

I'd give H-1000 a try. H-1000 is very consistent and accurate in my 300 RUM

R26, R17

IMR 7828 SSC is your huckleberry. It will generally shoot better than H1000. Don’t let the nerds talk you out of it because of temperature sensitivity, because like most BS in the campfire, that isn’t an issue…

R-22 works pretty good

RL26 is what I currently use. Accurate Mag Pro also worked very well.

Been using 7828 in mine for over 20yrs with everything from 168s thru 200s. Never found anything that works better.

Another vote for IMR-7828. I use the old standard version, cuz that's what I have. In couple 24" M700s get 2975 fps with 200 gr NPs. Also push 150 gr TTSXs to 3350 fps, using as reduced a charge as I'd want. Accuracy is superb.

RL26 would make them fly! Magnum is probably right there as well!