My back of a scrap of paper calculation is
Bullet dwell time to get up to speed and exit a 600mm long barrel 0.002 Seconds
Barrel that lasts 1500 rounds x dwell time @ 0.002 seconds and your barrel has lasted approx 3 seconds
Caliber that maybe gets 3000 rounds before the barrel goes west
3000x 0.002 seconds equals 6 seconds of barrel life
Maybe you shoot a mild load in a sensible ( some would say boring ) 308, look after your barrel and get 5000 rounds out of it
5000x 0.002 seconds equals 10 seconds of fun
I credit this info to a fallow forum member that put this idea into my brain recently.
It puts into context the time and effort ( and money ) that goes into building decent barrels, profiling, fitting, chambering and finishing rifle barrels
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