Since the .30-06 arrived in 1906, cartridge designers have tried to beat it with the same bullet and a better case. The results are this shelf, and reading them in order shows what each generation thought the answer was.

Four answers, roughly by decade.

1925: a longer belted case

300 h&h mag ammunition was Holland & Holland's “Super .30,” a belted case with far more capacity than the .30-06; it won the 1935 Wimbledon Cup and set the template for the .300 Weatherby and .300 Win Mag that eventually buried it.

1944–1996: more powder, more belt

300 weatherby magnum ammo was Roy Weatherby's 1944 refinement of the H&H idea and remains the most-loaded Weatherby; the phrasing here is the plain shopping form for loaded rounds. The far end of the same logic is the .30-378 covered elsewhere in this series.

1999–2000s: drop the belt, keep the capacity

300 ultra mag ammo opened the beltless era in 1999 on a huge case. .375 cheytac took the same idea to its extreme in the 2000s — a .408 CheyTac case necked to .375, beltless and enormous, built for shots at two thousand yards and beyond rather than for any hunting field.

2018: stop chasing speed

.300 prc bullets is the argument's current conclusion — a moderate-capacity case with a long neck and a fast twist, built for heavy, high-ballistic-coefficient bullets that hold velocity at a mile rather than winning the first hundred yards. The phrasing here reflects that: shoppers search it by bullet as often as by cartridge.

The rounds that never joined the argument

375 ruger ammunition sits on the same shelf without ever chasing .30-caliber speed — it is a .375 built to fit a standard-length rifle, not a .30 built for distance. 300 hammer ammo and .375 socom are AR-15 rounds whose goal was feeding from a magazine well. 30 tc ammo is a 2007 bolt-gun round whose goal was .30-06 performance from a short action, and .300 savage is a 1920 lever-gun round whose goal was a deer at two hundred yards. None of them lost the race; they were never in it.

Velocity and performance references are historical factory claims that made each cartridge notable, not measured performance of any current load. Confirm current stock and any state shipping restrictions before ordering.