Hey there...

I was on that bowjackson website checking out figures and whatnot regarding my old PSE bow and the XX75 arrows.

(Butch - stop it... You're old bow is set and is set as good as it's gonna get. Stop messing with it and stop bothering with calculations... You'll hurt your brain....) I can hear you all saying this to me!

Anyway, I read on the internet about finding your arrows true FOC (Front of Center) by balancing it on a nail and dividing the results, subtracting .50 then multiplying to a percentage.

See the image of my arrows below... The top one is an Easton XX75 Camo Hunter with a 125gr Thunderhead. Cutlength: 30.5"

The bottom arrow is also an XX75 Camo Hunter but with my new Magnus Stinger 4 blade 100gr broadhead. Cutlength: 30.5"

Thunderhead: 19" balance point on nail.
19 / 30.5 - .50 * 100 = 12.29 FOC
Total arrow weight: 568 grains

Stinger: 18.5" balance point on nail.
18.5 / 30.5 - .50 * 100 = 10.65 FOC
Total arrow weight: 543 grains

My bow (old PSE 65#, 65% letoff, 30" draw) shoots the Stingers beautifully and so amazingly accurate, I still can't believe how well they fly! I am totally serious... they hit the exact same spot as my 125gr field tips. No tuning needed at all. (Well then again, I did use the spare rubber O-rings from the old box of Thunderheads and used them on the Stingers, so I could align the main blade vertical with the bow string.)

What do you all think of these figures and calculations and stuff? I mean, a 568gr Thunderhead is going to hit like a Mack truck. It does have a teeny bit of drop compared to the 125gr field tips. The 100gr Stingers at 543gr fly beautifully and probably a hair more fps. I wouldguess...

Butch A.