HSM Game King .300 Remington Ultra Magnum ammunition (part no. 300RUM13N) loads a 180-grain Sierra GameKing Spitzer Boat Tail for big-game hunters who want confirmed, repeatable terminal performance. HSM hand-loads short production runs using premium bullets from Hornady, Sierra, and Berger rather than mass-producing generic projectiles. The boat tail profile holds velocity downrange while the tapered jacket delivers controlled expansion on game. Brass-cased and 20 to a box, it is built to feed reliably through bolt guns and semi-autos chambered for the cartridge. In our rifle ammunition lineup, this .300 Remington Ultra Magnum loading is a confirmed, dependable choice worth adding to the cart.

Key Specifications

• The chambering is .300 Remington Ultra Magnum, a high-capacity magnum built to push heavy bullets to magnum velocities for the longest shots and biggest game.
• The bullet weighs 180 grains, setting the balance of velocity and downrange energy this load is tuned for.
• The bullet is a Sierra GameKing Spitzer Boat Tail, the projectile HSM chose to load behind .300 Remington Ultra Magnum.
• The boat tail profile holds velocity downrange while the tapered jacket delivers controlled expansion on game.
• Cases are Brass, holding pressure reliably and staying reloadable for handloaders.
• Each box holds 20 rounds, enough to confirm zero and still have rounds on hand.
• A case ships 20 boxes (400 rounds total), ideal for stocking up or buying once for the season.
• At about $4.04 per round, the price reflects the bullet construction loaded into this round.

Frequently Asked Questions

What game is the 180-gr Sierra GameKing Spitzer Boat Tail suited for? With .300 Remington Ultra Magnum behind a Sierra GameKing Spitzer Boat Tail bullet, it is built for deer-class game and similarly sized animals within the cartridge’s normal hunting range.

How many rounds come in a case? A case ships 20 boxes of 20, 400 rounds total.

How is the Sierra GameKing Spitzer Boat Tail different from a standard cup-and-core bullet? The boat tail profile holds velocity downrange while the tapered jacket delivers controlled expansion on game.

Buy the HSM Game King .300 Remington Ultra Magnum 180 gr Sierra GameKing Spitzer Boat Tail

A load you can trust round after round is worth more than a marginal ballistic edge, and this .300 Remington Ultra Magnum loading delivers exactly that. Pick up a case and put it through its paces before you need it. Order from our Lubbock, Texas gun shop and it ships fast to your door.