I haven't checked my throat erosion as yet, we're in another lockdown so no shooting yet again, but if you're using a single base powder of real slow burn, it will be quite progressive on throat erosion.
I tested 2 barrels in 300WM some time back, 1 really liked RE25 and the other really liked H1000, the latter had 1/3 more elongation in the throat while the RE25 barrel had a lot more haze cracking with the same round count.
The H1000 barrel was setback and re-chambered at 1132 rounds, the RE25 barrel was at 1648 rounds when it was setback and re-chambered.
Have seen this a few times now.
My old 22-250 ran 760 only, the newer ran Varget, the older barrel (CM) lasted longer than the new barrel (SS).
It really is how hot the powder runs in YOUR application that determines how much throat erosion you get.
My custom 25-06 erodes by .020" every 100 or so rounds with RE25.
Double base powders are reported to burn hotter, but they also yield more energy per specific gravity than single base and therefore often use less powder for the same output. Then you have ball powder that behaves totally differently in a cartridge than stick powder and even though double base, it burns the coolest of the lot.
Hope this makes sense.
Cheers.