Question: what is the difference between a 270 and 270 short mag?
Answer: 270 WSM is about 150-200 fps more than you get with the standard cartridge. ... 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 give a greater increase in velocities.