Gap Puzzle

[YosemiteSam]

Just for kicks, I shot my hunting arrows out of a different bow and got some odd results.

Same arrow -- 680 grain woodies -- 27.875" to back of point.  Same draw - 3 under with middle finger index.  Both flying straight as a laser.  The Samick is drawn a little further until the clicker breaks.  Same bear hair rest.

Bow 1: Browning Cobra 50" AMO (short little recurve) 47# draw weight - gap is about 18" at 20 yards and a PO range of about 28 yards.
Bow 2: Samick Sage 62" AMO 50# draw weight - gap is about 8" at 20 yards with a PO range of about 27 yards.

The similar Point-on ranges are not surprising since I suspect that they're being launched at similar speeds.  But why the dramatically-different gaps at 20 yards?  Seems to me that similar PO ranges should yield similar gaps.  Anybody able to help me wrap my head around this puzzle?

[9 Shocks]

Yes, odd!

Perhaps how the tiller of the 3 piece is vs the one piece or how the limbs are bending?  Maybe the way the shelf is constructed and how the arrow is sitting at full draw?

Im just throwing out some ideas here.

Not entirely sure!

[blacktailbob]

Nocking point at same on both bows?

[McDave]

Don't know if it has any relevance to your situation, but a change in anchor would explain your result.  For example, one of my anchors is to press the string against the bone behind my eyebrow.  For a short bow, my head comes forward more to make this contact, thus reducing the distance between my eye and the arrow, thus reducing my point on.  For a longer bow, my head stays more upright, and thus my eye is farther away from the arrow, thus increasing my point on.

When you do something that reduces the point on for a fast bow, it also reduces the midrange gap.

[YosemiteSam]

Nocking point at same on both bows?

DING!

That was it.  Thank you.  Nocking point on the Samick was 3/4" (measuring to the bottom of the nock set) vs 9/16 on the Browning.  Raised the nocking point on the Browning and the gap shrunk right up.  Arrow still seems to be flying straight so I'll lock it in.  Much appreciated!