I hunt mainly 50 to 300 yards and I always clean out the copper.  I use Pro Shot copper solvent IV which does a great job.  Using it on my new barrel break in. 

I run the bore brush a couple times then patch it till its clean. Oh about every 100 rounds or so .Though I know it's not enough to get it all out. I do that kind of cleaning less frequently.

mpro7 that is all!.

I used to be the type that cleaned religiously every singe time I went to the range.  After much, much reading I've been trying the “lazy man's” approach.  If I'm working on load data I'll run a mop down the bore between loads.  And the only reason I do that is to give each load the same starting point as far as a clear bore goes.  At the end of the session all I do is use standard cleaners to get the grime out of the bore and finish with a quality oil.  I don't cut the copper until the groups begin to fall off.  I've done this for this entire summer and my groups have actually gotten smaller to be honest!!