How about a chrome lined 7.62mm Barrel?
Chromoly Steel
The chrome lined barrels on the SR-25 EMC's stay sub-moa till around 11k rounds, after that the gas port errosion tends to eat into reliability, though the barrel still can one hole them. These are dual role guns that generally shoot a lot of close quick fire rounds as well.
A normal chromoly steel M110/Mk11 barrel will generally degrade around the 7k mark.
All the above depending on firing schedule, I was in Singapore for a trial, and they had some old SR-25's that had the cold hammer forged barrels that had 18k and still where the hammer of hell in the .5MOA mark out to 800m -- however that user group cleaned them well and treated them like a bolt action rifle more than a semi-auto.
I'll shoot some 10 rd groups this week and compare and contrast to the 5 rds groups.
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