Savage project rifle. Started life as an'06, and is now a .458 muzzleloader.
Top 3 group are 150 grain bullet,
Bottom 2 are 165 grain. Both groups are using 70 grains N120 and the sabots weigh 42 grains. ( 100 yards)
Muzzle flash is much less with the 165 (207 gr. total weight) verses the 150 grain bullet so I suspect that I need a faster powder.
I have not chronographed them, but suspect 2900-3000 fps.