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

Kimber 1911 Ds Warrior Gotw 1
Kimber 1911 Ds Warrior Gotw 1

Gun of the Week: Kimber 1911 DS Warrior LW

In 2026, Kimber developed its 1911 DS Warrior, an American-made, double-stack design that is intended to be an affordable entry point into Kimber's double-stack handgun line.

The Armed Citizen® April 24, 2026

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

Spin Difference: The Impact of Barrel Twist Rates on Terminal Performance

When most shooters think of rifling-twist rates, they mostly think of rifles with their high BC projectiles, but the rpm of a bullet also plays a part in terminal performance.

Beretta's 1301 Tactical vs. A300 Ultima Patrol Shotguns: Which Should You Choose?

Ever since Beretta launched the A300 Ultima Patrol shotgun in 2024 as a less-pricey alternative to the 1301 Tactical, shotgunners have debated whether the 1301 is worth the extra cost. Let's examine them both.

ZEV Technologies Escaping Washington State’s Hostile Political Climate

ZEV Technologies announced it is moving its headquarters and manufacturing operations out of Washington state to Utah’s Second Amendment-friendly business climate.

U.S. v. Hemani Arguments

On March 2, the U.S. Supreme Court heard oral arguments in U.S. v. Hemani. The case involves a defendant who is fighting a federal indictment for possessing a firearm while being a marijuana user.

Interests



Get the best of American Rifleman delivered to your inbox.