Simplification is that throat erosion is a function of volume of powder burned (btu's produced), bore diameter, and chamber pressures. Powders also burn at differing temperatures.
Take a .308, neck it down to 7mm and forcing that plasma jet through a smaller tube creates greater erosion/fire-cracking than would be in the .30 cal bore.
What's sometimes overlooked besides the often discussed "hot" loads is the heat buildup in the barrel.
Rapid rates of fire, as in competion, increases temperature much faster than can be dissipated increasing throat erosion. 22-250 in F-Class maybe 1500-2000, hunting perhaps double that. Application has a LOT to do with it. In comps applications, barrel/throat life is not a consideration. I would say 2300 rounds is certainly in the realm of realism, without knowing your shooting habits.
This is often quantifiable, as in "x" thousandths per 500 rounds fired. Assuming you're chasing the lands as the round count increases, the throat wear should be obvious to you as adjust your seating depth as the round count goes up.
If you want longer barrel life, you need to select a more "throat friendly" chambering. You mentioned benchrest, but did not specify competition. If you don't shoot competitively, keeping your shot strings short and well spaced- and not allowing the barrel to get too hot- will minimize the erosion.