CarlsenHighway:
If you want 3100 fps with a 100-grain bullet, you should try Hodgdon's Hybrid 100V. My 22" Ruger .257 gets 3250 fps with a 100-grain Sierra with fantastic accuracy with data from Hodgdon's website.
H100V is the speed champ. See my link posted earlier.
100 gr. TTSX is a killer at 3,250 fps.
Accurate, too.
DF
