Ok so I have a Hunter 72# 29inch draw shooting 28 1/2 CX hunters 350 wieght forward arrows with 100 grain heads NAP Apache rest. Now on wed. I shot 5 different broad heads 2 blade Bloodrunner/3 Blade Bloodrunner/ 100 thunderhead/a old Bear two blade/and a G5 montec/ Now they all flew and hit with my field points out to 50 yards. Now I went to the archery shop and bought a pack of 4 blade MX-4 muzzy's because they were 26$ I refuse to pay $40 anymore for 3 broadheads.. Now I have the same exact arrows as above but they have on them the NAP shrink vanes not the factory blazers. I put on the Muzzy pratice head and boom I was 4 inchs low of bullseye at 20 yards 5 times. I then put the practice head on one of the arrows with factory balzers on it and right back in the bullseye. Now I saved the arrows fletched with the NAP shrink vanes for hunting, I lowered my whole sight down and all the pins are set for the broadheads all the way out to 50 yards but if I shoot my field points now I am 4 inchs high.. My quetion is why is the shirnk vanes doing this????? Do you think it is changing the spine of the arrow?? I am going to try and cut off the extra wrap that is below the vanes tomorrow but it is just bugging me why this is when the muzzy head on the arrows with factory blazers are hitting the same as my field points???So it is no dought the NAP vanes causing this I just don't know why..Thanks for the long wind version..Walt
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