Here is a 100g pure copper Hammer Hunter that will take your 270 Winchester to about 3600 fps. Or think about running a 270wsm at around 3800 fps. Big game hunting with really fast bullets that can hold together is very cool!
Minimum required twist is 1-11.5″
Bullet length is 1.03″
Nose length is .6171″
Bullet weight is 100g
Recommended use: Big Game Hunting
g7-bc= .155 estimated
g1-bc= .310 estimated