10/16ths or 13/16ths at 50 meters. Converting to yards that's 1.14 MOA at best or 1.49 MOA at worst.
These groups were at 50 meters
, and not at 100 yards... Right? Were you at a sturdy bench, wind velocity? Any other variables that could cause a group to widen? If you were doing everything on your part, then these groups really suck. If I were you I would do as others have suggested and get some good ammo like Hornady, and test on a good weather day.