I know of several Sako vixen .222 with shot out barrels, from the NZ deer culling days, including one Dad had in the 60, and 70,
I was told round numbers between 8000-12000 ish, depends on the desired accuracy,
The farm shed had suger sacks of .222 brass, piled high when I was a kid, wish I had access to it now.
Sum of Dads, shooters were shooting 2500-3000 deer a season, 3 months, daily tallys, 20-30 plus.
I know when goat culling on one shoot, I carried in 500-550 rounds of .222 and was out by day 4, the others had a .308,.243 and 30-30 and were out by day 2, 200-300.
I know of a Sako vixen .222 that's on its 5th barrel, all shot out,