Hi Bob 1961,
I haven't used the Buffalo Balletts, but I have used the Hornady PA conicals in 50 caliber in my T/C with good results.
They are very similar conicals, but the Hornady has a little thinner skirt at the base. The Hornady is only 240 grains, which probably allows for a little less recoil.
Take a look at them on the Hornady website. If you're only after Whitetail, they might be worth your consideration.
Regards,
Jerry.