I have a remington sendero in .338Rum. I am going to start reloading. I just bought the dies, RCBS press etc. I am trying to select a bullet. Cabela's has three bullets to choose from .338 Caliber 215grain .338 50 SBT GameKing Regular Price: $25.99 In Stock .338 Caliber 250grain .338 50 SBT GameKing Regular Price: $25.99 Backorderable .338 Caliber 250grain .338 50 HPBT MatchKing Regular Price: $34.99 Which do most recommend for 1000 yard shooting and what does SBT stand for? I am wanting to hunt with this set up but also be able to reach out to 1000 yards or so.