I have not used many solids but when it comes to hard cast bullets, to much velovity will start some expansion or at least deformation. Anything that causes a bullet to change a straight and true course will interfier with expansion. As much as some will deny this to the end, sometimes slower really is better. When it comes to big slow lead bullets, several million buffalo can't be wrong. Also when a 45-70 bullet will kill two Cape Buffalo with one shot and completly penetrate both, Its pretty hard so convince one that the 45=70 does not have what it takes. The story of the guy who took the African big six with the 45-70 marlin is also on that site. This along with several other feats that the old war horse can't do.