I have a GAP Crusader with the Bartelien barrel 22". I am wondering if anyone can give me a rough Idea how many rounds the bartelien barrels last before you see your groups open up? I don't shoot hot loads, usually max 2600 FPS on the 168's and 2550 FPS for the 175's. I have only about 300 rds through it, but am looking forward to rebarreling it in a longer tube and changing the bottom metal. I bought it to be a shooter and my primary bolt gun, and it has lived up to all I expected, but would like a longer tube and the ability to use AI mags. Thanks for any and all reply's gentlemen. Tex