A 505 Gibbs will knock the snot out of buffalo better than a 460 Weatherby magnum, at least that is what I have seen first hand.

Regarding the rest of the discussion. I use Woodleigh soft nose bullets in my 50's and have never had an issue. I drive them at better than 2350 fps and they have always passed through buffalo chests to date. The trauma imparted to the best is impressive, and they tend to die very quickly. I will continue to use the Woodleigh, but am currently trying out the PPSP. To me the SN is perfect for the broadside shot, as it destroys a large volume of tissue and brings them down quickly. However, the SN is being seriously taxed with "charge" stoppers i.e. the head-on head shots, which tend to mangle the bullet and reduce it's weight by at least 50% (in my experience). So I have opted to try out the PPSP, which does hold up better against heavy bone. Later this year we shall see how well it does at tearing up chest cavities, methinks. I am hoping it does well, and then I will be changing over to the PPSP as my first choice.

For me solids are good for only two things, which is what they were originally intended for, penetrating ele skulls and hides at are over an inch thick. Buffalo ain't got either. The solid does a miniscule amount of damage compared to a good soft point in my experience. This lack of damage, in my experience, had lead to excessive shots needed to bring an animal down and long tracking sessions. The last one being three hours long with a lung shot buffalo. Only one hit was achieved before the beasty got to cover and escaped any further follow-ups until we caught up with it again.

Scott