You have to remember that all powder companies max loads are calculated to be safe in all guns - so their recomendations are all lower than most manufactures. Bh does not no what weapon or condition of the weapon you might be shooting so they error on the safe side. According to Hodgdon 100 grains of T7 is max also.

So that is why you have to go to the rifle manufactures recommendations.

Also realize in most case 140 grains of BH produces less peak pressure than does 120 grains of T7-3f. Because BH is progressive it does produce more total pressure but less peak pressure.