300 WSM is a dandy cartridge. You will really like it.

I have one, and have had one other one that I sold to a friend.

I have loaded for three different ones. We use them for long distance ground hog shooting, and deer hunting.

The powder I settled on was H-414. I seems like H-414 gives a little extra oooomph to the cartridge.

The bullet we are shooting is the Sierra 155 grain Palma. A lot of people will say that this is not a good deer bullet. Well I say "Horse Puckey" to that. The bulet is devastating on deer. I would not elk hunt with it, but for deer the bullet is fine. You can buy the expensive bullets that I am sure some hunters will recommend, but IMO for deer these expensive bullets are completely unnecessary(but it is your money).

The 155 grain bullet makes the 300 WSM a fantastic flat shooting long distance cartridge. The BC on the Palma is fantastic. So you have great long distance capability.

We have also had good luck with the 165 grain Nosler Ballistic Tip. Tom.