R50 are not expanding HP's. They are round nosed match ammunition and shoot lights out in every rifle I have ever shot them in. Easily in to less than half inch at 54yds in my rifle. Not cheap but you get what you pay for.
Bizarrely, Eley Match shoot terribly in my Anschutz. RWS Hollow Point subsonics shoot about the same 3/4" at 54yds as the Eley Match.
They all like different ammo, god knows why. Although they are not the out and best HP subsonic in my rifle, of the various .22LR's that I have shot, CCI Subs seem to be the least fussy and tend to shoot well, if not amazingly, in pretty much every rifle I have seen. On the contrary, Winchester seem to be the most picky I have come across. My rifle hates them and so do not most I have seen but when you find a rifle that likes them, it really likes them.
An example below of getting what you pay for with R50. I always use RWS HP Subs for rabbits but when I want to shoot proper targets, I reach for R50