As many as you can shoot
So this is my 2nd 15-22. I have a black sport, and kryptic sport. My new black one (month old) ive put over 85,000 through it already and not the slightest hint of wear. Stove pipes on occasion yes, but no wear, or any other issues. 1st day i put over 3000 through it... I shoot a lot, and love mine. Id say i shoot 4 to 5 days a week practicing with it, as i have another AR built similarly and like to stay in shape, without spending tons of money on shells for .556 .223 .308! My Kryptic has over 50,000 rds through it and ive never even had a stovepipe, and zero wear. Keep in mind i clean religiously, each and every time i shoot, or run the course! I cant speak for anyone else but i can say for certain on the two i have, that zero to minimal barrel wear, and ive really put my guns through it! Rate of fire has been anywhere from 1 shot per minute, to 7 mags in a minute. I have to give it to S&W on this gun they did a fantastic job, and i will continue to put between 100, and 1000 rnds a day avg on mine for a good while yet. Ill try to keep up with this post to let you know. The brass weight is at 37lbs right now strictly 22lr in spent casings over the last month. I really think its going to take a heck of a lot more to wear the barrel down. Now CCI stingers (high velocity) run the best through both guns, and are very accurate! However the Remington golden bullet runs good also. Very few stove pipes for a plinking round. Win super X does alright also. I think it would take at least 500k+ maybe a mil+ before you had to worry about it. Just keep her clean, use a bore snake and plastic brushes, instead of the metal. That will add a lot of life to your barrel. Ive not touched it with a wire brush yet, and she looks as good as the day i bought her! So just take care of her, guarantee she will wear you out, before you wear her out.