Thanks to everyone for all of your suggestions. It's supposed to be in the mid 60's here on Monday. I'm going to head to the range and see if it's really the gun or the shooter. I did try using Sweets 7.62 to clean the bore and I was amazed at how much I got out of it. I'm thinking I may have had a little more copper build up than I thought.The last term I'd use to describe the 6x47 Rem is "finicky". Usually it's a very forgiving round to load for and very polite on the bore. I agree with others that something possibly has changed with the rifle. Once I ran in circles trying to figure out why a 308 suddenly went from a .3" gun to damn near shotgun patterns. After overthinking loads, rebedding the action and an embarrassingly long list of other brainiac theories I gave up on the gun and stuck it in the back of the safe. A year or so later I got bored and checked out the gun again with fresh and considerably less frustrated eyes. Within minutes I discovered the "mystery" issue: two scope mount screws were loose. What?! How could I have made such a rookie mistake? DUH!
Lesson learned. Start with the basics.