Just bought the 6.5-in. barrel version for some plinking and pest control. Unlike other revolvers I've owned, the cylinder is a lot longer than a .22LR shell. Haven't tried, but I think it's long enough that a .22WMR would fit. The gun isn't marked for .22WMR but is heavy and very robust. The manual is a joke and says nothing either way about magnums. Has anbody tried them in one of these?