Your results with this gun are very similar to what you should be seeing and confirm that you are doing your job behind the trigger. Charge weights 50.5, 51.0 and 51.5 are all good enough, but 51.0 not only showed the tightest group, it is the one most likely to still shoot to the same POI, if your loads are not as precise as these handloads.
Some guys go straight to middling charge weights and load in 3 tenths increments because of what you're seeing, right here. If you'd started at 50 grains and gone up .3 at a time, you'd probably have stopped at 50.9 or 51.2 and you might even go back and test those, using the OCW method. If not, 51.0 grains is certainly a very good grouping.
Personally, I would load up about 12 of those and shoot them in either 3 or 4 shot groups, taking at least 10 minutes between sets. If those showed consistently
tight groups, then I would chronograph 10 of them to determine ES and SD. Those numbers should both be fairly low and then you would be done with load development for this rifle/powder/bullet combo.
This set of loads/targets shows you are up to the challenge of shooting well so when your 22-250 gets back from Savage, you should be ready to find a suitable load for it, as well. Good job!