308 LH boyds prarire hunter stock, sav1 trigger. I shoot 3 to 4 times a year. I would like to optimise my ammo choice and thought about hand loading ? Or should I stay with off the shelf ? Shooting Hornady whitetail 150g. Should I be shooting something heaver with the 1/10 twist ? Looking to tighten my groups at 100+ . thinking after this season on bedding the stock and maybe a Witt break ?

Thanks all