I have a .22 High Standard Sharpshooter (Hamden vintage) manufactured around 1970. I've seen many warnings to not use high velocity ammo in these older pistols since it potentially will crack the frame over a long period of time. Does anyone know if there is a "cut-off date" on this limitation? Surely sooner or later, High Standard made a pistol back in those days that could safely fire high velocity ammo without frame damage????