I'm no Gunwriter but I have some of these for my 243 so I asked Hornady this question:
"What is the range of velocities that I can expect the best performance from the 6mm 100 grain BTSP, Item Number 2453, on deer size game? Thanks."
This was their answer:
"Thank you for your inquiry. The minimum velocity for expansion on the 6mm 100 gr BTSP is 1800 fps. It is capable of having a muzzle velocity window of 2500-3400 fps which is what we recommend."
Maybe someone could figure out at what range the velocity would drop to 1800 fps.
The Hornady ballistics chart on their website shows this bullet started at 2960 is traveling 2729 fps at 100, 2509 at 200, 2300 at 300, 2101 at 400 and 1912 at 500. I would extrapolate 1800 fps to be pretty close to the 550 yard range.
