Throat erosion is something to be concerned with, but I question how important it is in CQB weapons. When I shot Bench Rest, we would bring the barrel back about 1/8" every 5,000 rounds or so to have "Fresh Land and Grooves" to contact the bullet bearing surface. Those were .308's.
I have 6400 rounds on my MRP barrel, and even though I haven't checked the throat, it is still shooting sub MOA (checked it 3 days ago), which tells me something. The head space is still well within tolerance.
Tack

