Quick ballistics for 25gr at 3800fps with 100yard zero and 1.5" scope height.
Range Drop
0 -1.49
50 -0.39
100 0.00
150 -0.38
200 -1.67
250 -4.02
300 -7.57
350 -12.53

A maximum magnification of 20X, thin duplex 2nd focal plane reticle would be a good choice. Use hold-over, "aim half a dog high" and probably sight-in at 200yard for best poa/poi.
I've shot a few Pdogs with Leupold 6.5-20 and 4.5-14, and other scopes with 20-24X magnification, and definitely preferred shooting in the 12-16X range.
Back in the day, I was provided with Leica Geovid 7X42 class 1 rangefinder for testing in Wyoming Pdog towns. At the time, the only rangefinders were golf type and they didn't work well in the terrain.
Suggest adding a simple Kestrel to deal with wind, a decent RF.