l have shot about 1000 round out of my 7mm rem mag and the accuracy is still fine. l ownly use federal power-shock soft points(150grains) and lately l have been useing federal power-shock soft point 175 grains. l have heard all sorts of things about barrel life. l was wondering how many rounds does it take to notice a dramatic change in accuracy? l dont care about small changes in accuracy as l dont target shoot. so my question is: how many round does it take the 7mm rem mag to not be able to hunt at 500 yards any more???