Ammo Brief: .256 Newton

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Ammo Brief: .256 Newton

Have you ever heard of Charles Newton? Here we look at his .256 Newton cartridge.

One of several high-velocity rimless cartridges designed by Charles Newton for his bolt-action rifles, the .256 Newton was introduced in 1913 by the Western Cartridge Co. Until the .264 Winchester Magnum came along in 1958, this was the only American-designed 6.5mm to be offered on a commercial basis. The last of the Newton rifle companies failed in the early 1920s, and Western quit loading Newton cartridges in 1938. The .256 Newton is based on the .30-06 case necked down.

cartridges of the world 17th ed book
This is an excerpt from Cartridge's Of The World, available now at GunDigestStore.com.

General Comments

The .256 Newton has hung on as a wildcat cartridge and, occasionally, custom rifles are made for it. Cases can be made by necking down, reforming and shortening .30-06 brass. It’s adequate for practically all North American big game but is not as effective as the .270 Winchester. With modern slow-burning powders, its performance can be improved over original factory ballistics.  

.256 Newton Loading Data and Factory Ballistics

Bullet
(grains/type)
PowderGrainsVelocityEnergySource
120 SPIMR435055.02,9802,362NA
130 SPIMR489546.02,9002,425NA
140 SPIMR483157.02,8902,598NA
129 SPFL2,7602,180Western factory load

Editor's Note: This article is an excerpt of Gun Digest's Cartridge's Of The World.


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