I have been loading and firing 150gr nosler BT over 40gr of 3031 for several years now. In my carbine barrel it shoots very well (+/- 2" @100yds) and the burn is uniform on the cases. The CUP is comparable to 4320 around 39,000 and the recoil is mild. I neck size and have some with 3 reloads on them and I haven't burnt one out yet, but I do trim length everytime. The 1899 carbine seems to like it fine and it probably shoots better than I do. 4350, 4831 and 4320 will give you lower pressure and fuller cases and might be the better powder if firing 180gr class bullets. BTW the 150gr BT's civilize deer with a vengeance.