Re: 6.5-284 vs. 264 Win Mag
Yes, Pac-Nor threads many for Savage actions. I have built several off savages. Mine was on a rem 700 action I think. I do not have muzzle brakes on any of my 6.5's.
If you just want the hottest thing out there in 6.5 look at the best long range setups on the fourth page. That is a hot 6.5 on a 26" barrel based off the STW. Like I said my 6.5 stw is the fastest one I have done. When the case gets larger you just don't gain much because it just gets to overbore. Mine has 700-800 rounds through it and it still shoots excellent. Can't get on the range and just blast away with one though, heats up way fast. He is getting 3450 fps with the stw imp and a 140 grain bullet. I can hit 3400 with mine but my accuracy load is mid 3300's. It is one of the best long range rifles I have for deer and antelope hunting. When you get a .6+ bc going 3400 fps it talks. It is way fun to shoot. The wsm will do fine for what you want to do but if you want a hot rod, man this one shoots.
Predictions are difficult, especially when they involve the future