Shooting dirt clumps@ 325yrds+, ext mildot scope recommended?

I honestly had doubts as to PCP's carrying pellets this far, but after measuring distances with rangefinder, I can tell you that 325yrd plinking is very possible. I needed to keep scope on 3x and use the very bottom of it's vertical line as an alignment point, but I was watching the dirt clouds rise in a maybe 2-5mph wind. I was using JSB 15.4 old red tin pellets for the .22. The fields are segmented and I was trying to see if I could get anywhere near a clump on the farthest field of recently plowed dirt right before where the hay grass is coming up. It did it! I even walked out there and used the house as a range target for the laser, 312 came up, and I was in backyard so paced that off and it was 325 or more. So, I am now wondering if any scopes have mildots to the ends of FOV for long range plinking sessions.