The 270 Winchester Short Magnum or 270 WSM is a short magnum cartridge created by necking down the .300 Winchester Short Magnum and fitting it with a .277 caliber bullet. The correct name for the cartridge, as listed by the Sporting Arms and Ammunition Manufacturers' Institute (), is 270 WSM, without a decimal point.It is a member of the Winchester Short Magnum family of cartridges.. In the older cartridge, you can reach 2,950 fps with a 150-grain bullet, which I consider the most useful weight, while in the .270 WSM you can reach 3,050. I found that the lighter bullet weights.

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Any heavier than that and you'll lose stability, so while the .270 Winchester and WSM are both good, flat-shooting hunting cartridges, neither make a sound choice for today's long-range shooting. Tighten that twist up to 1:8″ or 1:8.5″, and you'd certainly be able to push the 170-grain bullets, like the Berger Extreme Outer Limits.. Energy. Furthermore, the muzzle energy of a .270 Winchester round averages out to 2700 ft-lb, while a .270 WSM Winchester Short Magnum round averages out to about 3170 ft-lb. One way to think about this is as such: a foot-pound is a unit of energy equal to the amount of energy required to raise a weight of one pound a distance of one foot.