You can view and download the High Power Rifle Rule Books from the NRA and CMP web sites.
Look for the classification scores. These will give you an idea of what scores are good, very good, better, better still and best. In HP, those classifications are Marksman, Sharpshooter, Expert, Master and High Master. It is a way to equate your scores to a common level of performance used everywhere.
By the way, you can also use the classification system and its scores in your setting of goals and to help motivate you to improve. This is especially important if you are shooting independent of competitions.
One final word - don't look at the awards ("medals"), look at scores. Look at the classification percentages.
A final, final word - my Garand can barely hold the black no matter who shoots it, no matter how it is supported (even benchrested) during firing. Find out how much of your shot dispersion is the rifle. For mine, even with the best ammo, that is over 6" at 100 yards. I no longer shoot the Garand when I want to shoot accurately.