With the 100 gr NP's have you tried IMR 7828? Mine uses 53.5 grs of 7828 with a 95 gr NP and the velocity is 3365,with a 26.75" barrel. It has a 1-10" twist also.
Between the two choices you gave,the 100 gr NP hands down.
H-1000 and IMR-7828 were ho-hum in this gun. The best 100 gr. NPT group so far was with 57.5 gr. Ramshot Magnum. I'm going to try RL-25 and MagPro. RL-25 was the powder generating .33's groups with the 90 gr. Scenar. Very slow powders seem to be working better than the usual recommended ones for this .240.
I've been unable to get NPT 95's to shoot better than NPT 100's, the 10 twist notwithstanding.
Some of the usual 6mm bullet favorites have the potential to do crazy stuff at warp speed. It appears to me that over 3K fps, bullet selection can become a different ball game, at least for close up shots on game. And for >500 yds, I have bigger guns slinging more bullet mass, carrying >1,000 ft. pounds of KE out much farther than the .240.
DF
