I have never shot the Barret, however I would love to. While in the army I shot the M2 quite a bit. Plus as a tank crewman, on a M60A1, it had a specialty 50, I think M93 or 98, ummm I forget. Anyway it was a two speed gun. On low rate it was about 300 RPM. On high it was about 2000 RPM. On high rate with a tracer every five rounds, it looked like a lazer beam going out to the target. On High you strived to do about a 15 to 20 round burst.
Doin' what I can, with what I got.