Had a Grendel many years ago.
Almost every case would split, as the chamber had several raised striations. Running longitudinal with the chamber.
I think it was striated to keep the brass from sticking in the chamber.
I shot the hell out of it with every .22 mag I had . I would have kept it but could not find ammo that wouldn't split.
Get a PMR 30 if you want a good .22mag semi. Almost as ugly.
