Use what you will, I don't have a problem with it. But there is no .22M ammo that turns it from a **** to a dragon slayer. With identical shot placement the odds a bad guy is gonna react notably different between standard ol' everyday .22M loads and the new designer loads is so close as to be a non-factor.
My only recommendation is to stay away from the true lightweight, plastic tipped varmint ammo. Other than that any HP in 40grs on up is gonna be about the same.