The 338 RUM that I build for my hunting buddy had it's first borescope checkup at 1000 rounds down the 32" stainless Rock Creek barrel. Dr. Borescope said everything is fine and continue to shoot! All but the first 15 bullets have been coated with WS2/Danzac. The 300 gr SMK's are launched at 2950 fps, so, as you can guess, there is close to 100 grains of powder in the case. Barrel has been abused as well. Sometimes, as many as 20 shots in a short amount of time during practice or extremem long distance when shooting in the the windy sandhills of Nebraska. To date, the longest deer harvested with this rifle is 1868 yards.

My 223 AI that I use to shoot in the field the most, has over 2K rounds down the tube and still very accurate as well.