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

Armasight Operator thermal riflescope
Armasight Operator thermal riflescope

New for 2026: Armasight Pro Series Thermal Platform

Armasight launches a professional-grade thermal-imaging platform designed to perform.

KelTec Launches KelTec Direct

KelTec begins its 35th anniversary celebration by launching KelTec Direct.

New for 2026: CVA Scout XP and XP-SB Rifles and XP Pistol

CVA expands its Scout line to include two single-shot rifles and a single-shot pistol.

Preview: Winchester After Hunt Dog Bed

Named after John Olin’s famed hunting dog, the King Buck product line exists within the larger Winchester Pet brand to showcase the company’s most deluxe offerings, and the After Hunt Dog Bed is a prime example of the line’s quality.

Review: CZ USA P10 Ported

CZ expanded its popular line of P10 handguns with a specially configured model that features integral barrel ports just behind the muzzle to aid in recoil management.

Keeping The Wilderness Quiet: Bergara's BTi30 Suppressor

Bergara joined the growing crowd of suppressor manufacturers in 2026 with its BTi30 design.

Interests



Get the best of American Rifleman delivered to your inbox.