davidmil, can you tell me approx. what KE I'm shooting? I shoot a Pearson Anaconda 67# 29"draw using Easton 2413 Superlite XX78 Super Slams Select with 100gr heads. The arrow length is 29 7/8" from head insert to nock valley. I don't know if it matters, but the bow is a single cam, 36"ATA. I have no idea how fast the bow is shooting. The manufact. says IBO is 310 but I have read someone got more like 270-275. Is this enought info? Thanks.