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I'll lessen the PC back to 41gr or so and let the barrel copper foul a bit. See what happens then.
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Actually, what you really need to do is start over.
According to the 7th edition Hornady manual, the starting charge for IMR4895 in 308Win with 168 grain bullets is 35 GR @ 2100 FPS. Charges are listed as:
35 GR @ 2100 FPS.
36.6 GR @ 2200 FPS.
38.3 GR @ 2300 FPS.
40 GR @ 2400 FPS.
41.5 GR @ 2500 FPS.
43.3 GR @ 2600 FPS, Max load.
If I was starting from scratch with these components, I would probably load 8 rounds each (10 would be better) at 39.5, 40.0, 40.5, 41.0, 41.5, and 42 grains and shoot a group with each to see which shot best. Shoot free recoil from sandbags, make sure you scope is properly parallax free
With a short action the magazine may limit this, but I like to measure the seating depth to the lands, then back off the OAL slightly (~.020" or so). You can also make up test batches with various seating depths to try and determine which your particular rifle likes best, but I have always got acceptable results determining seating depth/OAL this way.
As to cleaning, I clean when accuracy drops off. Depending on the rifle, this can be a long time. I have been on a P-dog hunts where I shot a few hundred rounds with no noticeable drop in accuracy.
Also, how are you cleaning? From the rear with a bore guide I hope, with a good coated one piece cleaning rod. You can wear out a rifle faster with a cleaning rod than shooting.