I have a Sidewinder 30 that holds zero absolutely fine on my 17fpe .22 97K or any sub 13fpe gun in my safe. Put that same scope and mount combo on my 16fpe HW95 or a 19fpe D56 and the recoil throws shotgun groups. I know the D56 is a scope killer but my question is this: a scope can go bad to the point where it just won't work on heavy recoiling guns but still working fine on the more docile ones? I haven't run into this before.