Digger, I can get a half inch if I do my part with these bullets.
As far as cleaning goes (get ready
)
First, get ALL of the copper out of your bore before you start shooting moly coated bullets.
It usually takes ten to fifteen rounds for my gun to settle in before the groups start to tighten up. Some have reported as many as 20 to 25 rounds necessary to "season the bore".
My .223 is old enough, and the bore is "broken in" enough that even when I was shooting uncoated bullets, I may not clean it for 50 to 75 rounds. Now, I can usually go a hundred or more before I start seeing groups accuracy suffer.
Hunting coyotes all season long is definately not a problem.
In the summer, when I get to shooting prairie dogs, I may clean the bore after a hundred rounds. But, I pretty much just punch the tube with some Hoppes No 9 a couple of times, then punch it dry. I will get a VERY SMALL amount of copper fouling out, a bunch of powder fouling, then start to see a greyish material on the patch. That's the moly coming off on the patch. I usually stop right there.
If I want to get it completely clean (if for instance I want to shoot some non coated bullets in it), I use Hoppes, and scrub it with a bronze bristle brush. When the patches come out clean, I switch to Butches Bore shine and a brush. I keep at this until the patches come out clean. I'll store it with Breakfree CLP in the bore afterwards.
As far as moly building up in the bore: I really don't know if this is a problem. Doesn't seem to be for my particular gun. 'Course, I've switched back and forth enough that I've completely cleaned my gun several times to get it all out also.