I went to sniper school at Quantico in 1987 (Marine Recon). Only .50 cal barrels are that big in my experience. Somebody went crazy on that rifle if'n it ain't a .50. The return in MOA for a barrel that big would be more than offset by the extra weight IMO.
But what do I know anymore. I qualify for dinosaur status now. My night vision was ANPVS-3 1st gen, we used a map and compass for land nav (no GPS), and we got the 1st sat phones the last year I was in.
I was in at the beginning of Gen 1 Gortex.