I use double bevels, but keep in mind that I probably have 100 or more laying around here that Jerry gave me over the years and none of the newer ones. That's a lot of surplus 190 gr. Interceptors considering how well they hold up. FYI, when I use the insert blades on deer, it's to decrease the chance that the main wound channel (wide slit) doesn't align itself with the "grain" of the outermost muscle tissue on either side of the animal, which is the reason that Fred Bear use to say that you "shouldn't shoot a two blade head at a big game animal." Bear's little break-a-way bleeders helped cut an X hole that helped keep the entrance and exit holes more "open" all the way into the body cavity, the idea being that it would spill more blood on the ground thus producing a better tracking situation. A hole is better than a pinched off slit, etc, etc.. I've used 2 and 4 bladers and finding animals isn't a problem when the arrow's in the right place, BUT . . .? Food for thought. Both types have done fine for my purposes, but the 4 blades do create a different wound channel dynamic, one that might serve the hunter better on marginal hits.