I shoot an HHA slider so a single vertical pin with yardage markers for 20,30,40,50 and 60. I would think (probably wrong) that the spacing between my yardage markers would be somewhat symetrical with of course a widening gap for the longer yardages. What's weird is my gap from 30-40 is noticeably wider than my gap from 40-50 or 50-60. Seems like my arrow decelerates more from 30-40 than any other distance. I shoot a "lot" and know that my yardage markers are spot on and just wondered if there's a logical explanation for this. Inquiring minds want to know and I know there's a "lot" smarter guys on here that might know the answer.

Dan