Loading for a new Tikka T3 300 winmag.I have Hornady 165 BTSP & 180BTSP.IMR 4831 4350,& H450. Fed 210m,215& win LR primers and winchester brass.I am looking for tried and true formulas,I know R22 is very accurate but in Canada I have temperature sensitivity concerns.Any loads will be appreciated and started lower for safety.
Thanks in advance RB