Handloads: .300 Winchester Short Magnum

posted on May 4, 2020
** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. **
handloadswin.jpg

Federal’s new Terminal Ascent bullet traces its origin to the Trophy Bonded Bear Claw developed by Jack Carter back in 1985, with a front lead core bonded to a solid shank of copper.

Federal upgraded the Bear Claw to the Trophy Bonded Tip in 2007 and the Edge Terminal Long Range in 2017, which featured a slender ogive capped with a Slipstream polymer tip and boattail for a high ballistic coefficient. Its tip breaks off on impact, exposing a hollow point designed to cause expansion of the bullet at velocities as low as 1400 f.p.s.

The Terminal Ascent adds a bright nickel coating and, on most of the bullets, a second AccuChannel groove around their shanks to even out shot-to-shot pressure and reduce fouling.

H4350 is a good choice for handloading the .300 WSM, and it performed well with Terminal Ascent 175-gr. bullets. Average velocity was 3001 f.p.s. fired with a 65.0-gr. charge for an extreme spread of velocity of 22 f.p.s. over nine shots.

Magnum cartridges require 10 to 20 grs. of additional propellant to drive .308" bullets just 100 to 150 f.p.s. faster. Five, three-shot groups shot with Ascent bullets varied in size from 0.82" to 1.57" and averaged 1.24" fired with a plain-Jane Winchester Model 70 Featherweight.

Federal states that Ascent bullets also expand down to 1400 f.p.s., which would make 175-gr. Ascent bullets fired from the .300 WSM deadly out to about 1,000 yds. According to a ballistic program, though, shooting that far requires compensating for 22 ft. of bullet drop with bullets hitting 2" above aim at 100 yds. Let’s go with a more realistic 500 yds. with 33" of drop, and call it good.

 

Latest

Mendoza RM22 01
Mendoza RM22 01

Hecho en México: The Mendoza RM22 Rifles

Mendoza Firearms claims that its RM22 rimfire rifle is the first indigenously produced rifle to be exported to the United States.

Preview: MGE 1911 Grips

Mammoth Grip Exchange is a small startup company that specializes in crafting replacement stock sets for M1911-pattern pistols in a dizzying assortment of exotic materials...

Gun Of The Week: Mossberg 990 Aftershock

For this Gun Of The Week episode, American Rifleman staffers hit the range with the Mossberg 990 Aftershock, a non-NFA, shotshell-firing firearm that provides plenty of power in a compact package.

The Armed Citizen® Nov. 14, 2025

Read today's "The Armed Citizen" entry for real stories of law-abiding citizens, past and present, who used their firearms to save lives.

Christensen Arms Evoke: A Budget-Friendly Hunting Rifle Built For The Field

For hunters seeking a well-built, no-frills hunting rifle, the Christensen Arms Evoke offers a host of desirable features, all at a price that leaves room for hunting tags and travel costs.

Wholesale Change in Glock Lineup & Other Industry Moves

Fall 2025 has proven to be a volatile time within the firearm industry, with companies like Glock announcing major changes to its product lineup, while other companies announce expansions and moves.

Interests



Get the best of American Rifleman delivered to your inbox.