I finally started shooting woodchucks with my airguns and it is like when I started shooting them as a kid with a .22, it's fun again. I took the long way to get back to here, did the whole tour; .22 to .22mag to 22-250, played with a .17hmr for a while and now, PCP. I really love being able to not scare everything to ground and getting more opportunities for shots. I had tried using a 30fpe .22 Gauntlet last year but after one shot decided that I wasn't comfortable with that power level and moved to .25 caliber. I have a P15 shooting JSB Kings at 45fpe and a MROD shooting JSB MkII's at 58fpe and yesterday shot a chuck with the P15 and today another with the MROD. The difference in performance seems to be bigger than the numbers would suggest. I won't be using the Kings any more for anything bigger than squirrels. Even with the P15 shooting them a lot slower, the MkII's do 50fpe and it seems to me that energy on target is more effective with the heavier pellet. Luckily, for me, they both shoot very close to the same accuracy out of each gun. I know that everyone around these forums loves their 40 for 40 tunes and using the Kings but I am going to pass on that for woodchucks at least. Another pellet that I have used on porcupines that really has awesome penetration is the Benjamin 27gr domes. Using the P15, at 15y, I shot at an old 2" thick Hemlock staging plank, and blew right threw it. That really surprised me at the time. The Kings are just going to be doing long range spinner duty from now on, they are great for that, and red squirrels. I have been mostly just really into plinking at long range spinners the last couple of years but there are a lot of woodchucks this year so it was high time to get back to work on them and it has been fun to actually have to try again.