I have a custom Mauser
in .280 Remington Express, that my father built up for long distance (600 yard) competition over 30 years ago...
he shot a DOCUMENTED 20k rounds through it.
I have kilely added another 5k myself!
25k, and the jeweling (yes, he made it "pretty" too) has VERY minor "polish" marks from it's 25k + cycles... (and remember, Dad polished it and jeweled it, removing materials in THESE processes...)
no appreciable wear to be seen, and it CERTAINLY hasn't lost a lick of accuracy either!
good luck with it!
ALSO, I have a neat idea for you customizers... I just conned dad... (gotta love that guy) out of an "experimantal" mauser 95 he built...
he took an ORIGINAL 7mm. mauser, and lengthened the threads on the barrel, and shaved the rear, effectively shortening the chamber.
then he took a .284 Win chamber reamer to it, making a .284 out of a 7mm, using a stock bbl... (he wanted to try it)
he used an inexpensive (choate) 'glass stock, and a Dayton Traister (soon to be a Timney) trigger, and a Bueller safety...
it came out SWEET, shoots a WHOLE lot better than I thought it would, and was built for 400 bucks, TOTAL... (included a mount and scope)
the older I get, the smarter my dad seems!