Which Huben K1 is more accurate? .22 or .25?

I just received my new Huben, in 22 cal, yesterday, so still tinkering and playing with adjustments. Very well built, and VERY powerful. I stick with 22 cal, as that is what all my other PCP's are, and have a ton of pellets stored up. Mainly just shoot in my back yard at 20 to 50 yards, punching paper, rats and fuzzy tailed rats! The HUben is FUN for sure!