PRS matches are won and lost on positional and barricade shooting. Don't get me wrong, you need an accurate gun to be able to hit the sub-MOA targets on the KYL racks and various prone stages. But if you can't hit 1.5 MOA targets shooting from barricades, tripods and other unstable positions, you're not going to finish near the top.
In many ways PRS is like Service Rifle; bringing a barrel heavy bench gun to a match is going to hurt you more than it helps you. Focusing solely on getting the ultimate accuracy out of a stable prone position is not the recipe for success. So, the small differences there may be between those catriges is meaningless if it even exists.