Weatherby‘s Select Plus line in .338 Weatherby RPM (brand part no. B338185TTSX) loads a 185-grain Barnes TTSX boat tail bullet for hunters who want magnum-level performance out of a standard-length action. RPM stands for Rebated Precision Magnum, a case design that uses a rebated rim to fit a standard bolt face and short action while still running the higher pressures needed for genuine magnum velocity from a more compact rifle. The TTSX is a lead-free, all-copper bullet whose polymer tip drives reliable expansion while the boat tail base cuts drag for a flatter trajectory downrange. For hunters who want magnum power without a magnum-length rifle, this rifle ammunition is built for exactly that trade-off.

Key Specifications

• The chambering is .338 Weatherby RPM, a Rebated Precision Magnum cartridge.
• The rebated rim lets the cartridge fit a standard bolt face and short action despite its wider case body.
• The bullet weighs 185 grains, a solid weight for big game.
• The bullet is a Barnes TTSX, a lead-free, all-copper design with a polymer tip.
• The boat tail base reduces drag, helping the bullet hold velocity and a flatter trajectory downrange.
• The case material is brass, giving reliable extraction and standard reloading compatibility.
• Cost runs about $4.86 per round, in line with premium copper-bullet magnum ammunition.
• Each box holds 20 rounds, enough to confirm zero and still hunt the season.
• Shipping weight per box runs 1.5 pounds, useful for hunters ordering multiple boxes.

Frequently Asked Questions

What does RPM stand for? Rebated Precision Magnum, a case design that fits a standard bolt face and short action while running true magnum pressure.

Do I need a magnum-length action for this cartridge? No, the rebated rim is specifically designed to work in a standard-length short action.

Is this bullet built to expand? Yes, the Barnes TTSX’s polymer tip drives it open into four even petals on impact while the copper shank retains weight for deep penetration.

Buy Weatherby Select Plus .338 Weatherby RPM 185gr Barnes TTSX Boat Tail

Magnum performance used to mean a magnum-length rifle, and the RPM’s rebated case is built to break that rule. Order from our Lubbock, Texas gun shop and it ships fast to your door.