So just some math
barrel life~3000 rds
~ 50grs. powder per round
3000x50grs= 150,000 grs.
150,000 grs / 7000 grs. per pound = 21.4 pounds of powder to "burn" out a barrel.
21 lbs of powder x$65 =$1365
Bullets ~ $50 x 3000 =$1500
High priced Primers $10 x3000 = $300.
Still cheaper then buy a round of drinks for your "friends" on a Saturday night in the pub.