Another point, often missed, is that a 100 fps increase at the muzzle is nothing like a 100 fps increase at 500 yds. Depending on the bullet, it might be half that.
I messed around with freebore enough, 35 years ago, to convince myself it didn't make much difference in velocity. New powder may offer some advantage but not always. My best velocity in my 6 BR was with IMR4320. I've not seen any powder which did much more than 4350 does in the 30/06.
As others have already said, that 100 fps doesn't really mean much in the end. GD
