Hummer - my target is usually a human size figure, 50 cm wide and 150 cm tall. I usually go for hitting the target remotely where I would like to, because that is what I am training for, so I am shooting groups only from time to time. I rather go for certain scenarios - last time it was a 700ish meter target that I had to shoot to the head - one shot one hit. So it was 1 shot, to target and back on foot on a peat bog, and repeat about 10 times. So better not miss or the walk was in vain
The target picture, from Mfg. site
Mostly I keep it at 2 or 3 rounds per target. That 1000 meter shooting was 5 rounds (yeah, I know, it is a bit smallish side for accuracy test bench, but for me the MOA means I can put the impacts within a circle that big) and max distance between bullet holes was about 20 cm. I think I have a picture of a 903 meter target (5 shots though), with similar results.
As for the cleaning, I am running the 168 grain SMKs @920 m/s at the muzzle. Quite a light load for 300WM and it does not get the rifle dirty fast, or worn out. I am also shooting a few rounds within few minutes (well, depending on the purpose of shooting), usually mentioned 2 or 3, and then hauling it all the way to the target and back regardless of the terrain; if I am not lucky to have someone other saying it out - hit or not and where.. So the rifle does not get much heat usually. If I have to, I do make rapid fire, but I don't when I don't have to (I have another rifle for hosing any close targets
).
I have thought about the barrel life, or at least the useful life. I should do the group after every hundred or so, that is a good idea, true, to see any degradations in accuracy.