I believe the twist rate of my Tikka t3 Lite is 1 in 12. It shoots 1/2 inch groups, if I do my part with the Hornady 95gr. SST bullet.
I have used Sierra 85gr. HPBT and Hornady 87gr. HPBT. My gun was more accurate with the Sierra 85gr. HPBT.
My load for the Sierra 85gr. HPBT is 36.4gr. of IMR-4064 with a C.O.L. of 2.685". This load shoots similarly good groups.
I shot my biggest buck with the 85gr. Sierra and he dropped after taking 2 steps. When Hornady came out with the 95gr. SST, it peaked my interest as a heavier bullet with possibly better terminal performance at longer ranges.I don't know if this is the case, so if anyone can compare the 2 bullets in the field, I am sure it would be of interest to all of us who shoot the .243 Win.