Andrew,

Does not surprise me in the least...

A couple of notes

1) Did you test at different ranges? How close were you to the paper?

2) A bullet hole does not guarantee great groups, only straight arrow flight (asuming you get bulletholes all the way to the target).

3) I have found that it's pretty easy to get a bullethole with just about ANY onecam (assuming cam timing is correct), especially with a loop. As #2 though I've found most of them very sensitive to spine from a grouping standpoint. This is why as I said on an earlier thread I take little stock in paper tuning. One: I believe it's just about impossible for the majority of archers to execute perfectly all the time (including myself), and Two: I prefer a slightly "off" tear to prevent knuckleballing, and give the arrow some "direction".

4) I believe you have the matrix and ACC mixed up. The Matrix is available in a 460 spine, the ACC 3-39 is the 440 spine. At any rate, with the differences in cut length and tip weights the spines are likely very close for all the shafts you tested.

It would be more interesting to see how these arrow shafts grouped for you at various distances... say between 20 and 40 yards. I believe that you would find the stiffest shafts likely to group failry decent, and if you were to use some the heavier 340 spine class shafts the results would be even better.

Thanx for sharing! Cool info.

JeffB <img src=icon_smile_big.gif border=0 align=middle>