I disagree if you're referring to 30 caliber service rifles and their ammo. And all service rifles and the ballistically inferior little projectiles you mention.It's fairly easy and inexpensive to set up a service rifle that is fully capable of shooting 100 - 10x on every string until the person try's to shoot it offhand, or sitting rapid, prone rapid or slow prone from 600 with only a sling for support in sitting and prone only....
Then there's the ballistically inferior little projectiles that require you to pay attention to and correct for the wind or pay in points... Especially in 300 rapid strings and 600 slow prone
Most service rifle matches allow some of the same ballistic superior bullets that win benchrest matches.