Thanks for the replies. I shot ten more shots with each field tip withvery similarresults.

I agree OHbowhntr. The FOC is ideal with the 100 gr tip. This is what I have been using for my hunting set up. Also, Ishot thru thechrono and determined the following.

Arrow with 85 grain tip = 383 grains.....................275 fps= 64 ft lbs KE
Arrow with 100 grain tip=398 grains.....................271 fps= 65.4 ft lbs KE
Arrow with 125 grain tip =423 grains.....................257 fps = 62 ft lbs KE

This makes sense that the 100 grain arrow penetrated the deepest with the most KE. I think Indianahunter83 hit the nail on the head. With velocity being squared, it plays a larger factor than the mass in determining KE. Am I missing anything??????