I never bothered with charts in HFT.
I shot HFT @ 9x using a 30/30 ret. I used the thickthin+thinthick lines as references.
At 9x with kills ranging from 15/20/25/35/40 and most clubs using all sorts of in between sizes it's not that easy trying to measure with the ret. Remember you don't have the scope on high mag to tell you the range either ( you can't focus ). So you are estimating the range and also estimating the kill size.
... but for Mike's question ... always using centre of kill for me as that's where I'm trying to hit and centre of kill is centre of kill no matter what the shape or size of the kill is, or whatever distance.
Last edited by skires; 5th April 2016 at 08:13 AM.