What powders are working the best for you in the 300 WSM using 150 and 180 gr bullets?

150's, H-414 From 62.0 grains to 67.0 grains and Winchester WLR primer.

180's, H-414 From 59.0 grains to 65.0 grains and Winchester WLR primer.

Thanks ricciardelli, I have been breaking in a new rifle and loaded 150 gr. using H4350 and W760.

RJB

I've found H4350 and RL22 to be the best powders so far in my 300 WSM with 180 gr. bullets... I haven't seen the need for lighter bullets in this cartridge so can't comment on any other powder's except those for the 180's.

Brad

I two different rifles (Win M70 and custom TC Encore)RL19 and CCI 250 Mag primers have produced the best groups for me with Barnes 140 X home moly coated and 165 SSTs. Also Varget did very well with the Hornady 150 SSTs. I have some 180 Nosler Part. over some RL19 waiting to go..I'll post the results.
Dave