I have shot them with all kinds and there is no way to know !! But IMO deer run further when hit with mechanicals ........on pure adrenaline......due to the impact ! Where as......I have shot them with fixed blades and had similar experiences as Aurthur P. !
I like the bigger holes the expandables provide and the bloodtrails are great sometimes.......but most of my tracking has been 75-125 yrds with them !! My fixed blade experience is more like 30-100 yrds !!