The Hodgdon site shows a charge range of 38-42 grns of Benchmark for a 168 grn bullet. Other sources may vary, but why the need to go right to max charge weights with your 1st loads? Not ripping on you but the target won't care, your gun, brass & a few other things may thank you for lower charges. Just asking.
OBTW, my Sierra manual tops out at 41.4 with that bullet. Yes, the kids say I drive like a Grandpa at times too.