Tedd
FWIW, I never shot at a buffalo yet neither at a dead cow :D
As I did myself you can make your own testing. All bows in the low to mid 60# at 31" all those game killed with 1 1/2" 3 blades VPA/Big Jim
First the theorical part comparing on heavy density foam different design and width and see not that much difference between large Magnus 1 160gr 1 1/2" vs VPA penetrator vs VPA/big Jim 1 1/2"vs VPA 1 1/4"
Then practical part on big game. I am sorry but we don't have elk neither moose here and the biggest critters I killed using VPA / big Jim are only cape eland. A old cow, a young bull and 2 mature bulls. All 1200#+ Up to 1700# and rib thickness from 3/8" to 1/2". I got complete pass through on the young bull and the last one.