I tried a full case (to base of bullet) of Trail Boss with a 310gr. cast in my .375 - worked well, but needs more variation to find it's 'best load' with that powder. The velocity was 1,360fps in my 80gr. case.

70% of a full case is the starting load with that powder. A maximum load is a full case that does not compress the powder by the bullet. Do not compress this powder.

SR7625 powder shot under an inch at 100yards in my BRNO .375H&H, using 270gr. cast (Lyman mould) w/gas check and 23.0gr. using the rifle's little peep sight and bead front.