These make me smile how the app works the distance out to within a yard and yet the chances of the 'scope being set exactly (in this instance) on 12 power or the 12 power actually being correctly calibrated is about zilch. They do seem to work though, albeit with a not inconsiderable margin of error.
Still better than hold over and hope though.
Ive used the Swarvo one and Tract. The Tract ballistic reticle and program are excellent. By adjusting the zero you can get some really close round numbers. On my 300 saum Im sighted in for 230 yards and its all round numbers (3/4/5/600 yds) on the reticle. It works at 15 power and despite what I said above, it does line up pretty well. I still dial the 'scope if over 300 yards and if Ive got time. Ive shot deer out to 400 using the reticle though.
https://tractoptics.com/impact-ballistics#:2
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