ORIGINAL: 5 shot
I have shot 1 deer and 2 fox with spitfires. Deer had about a 1" entry hole, no exit (hit the off side shoulder) Both of the foxes and similar sized entry holes and huge exit holes. Overall I like the spitfires but I feel you need to be pushing over 60 ft/lbs of Ke to get the most out of them. Of all the mechanical heads I have tested the spittfires are one of the best in terms of quality of construction. Performance wise they are right in the middle of the pack.
A 1'' entry hole is comparable to a conservative fixed head.
I have 75# of KE with my X Force.