I have noticed recently I need to clean my barrel about every 20 shots. I didn't have to clean it this much in the past to stay accurate. When the accuracy drops off it shots about 2 moa. When a factory barrel comes to the end of its life cycle is this a symptom? To give some background I have just about 1000 rds through it and it is a 270 win. The first 300 rounds or so where 3600+ FPS varmint loads, I then went to a heavier bullet and more conservative loads for the rest.