I never understood why 120 grains is the heaviest .25 slug anyone ever made. Why not 125,130 or even 135. Just run a faster twist barrel like everyone else does when shooting heavy 22's or 6mm's? I bet a 25-06 or 257 Roy firing a 130 or 135 grain slug could really get it done way out there and compare to the 6.5's.
It isn't. There was a fellow a few years back making 150 grain bullets for the .25s. Used a 7" twist. Haven't heard much about it in over a decade.
