The 169's were the ticket. Will still need some fine tuning but it was solid right out of the box. They're longer with the ogive set further back, much like the Hornady 200 ELDX. With something like the Hornady 155 match, I can load them and get .002 off the jam (not the lands). Couldn't achieve that with the Sierra 169's so I loaded to mag length, 2.865", although I use the ogive measurement with the Hornady
comparator. I started at 43 grains of 4046 and loaded up to 45.5 in half grain increments. Had to stop at 45 due to pressure signs. But 43, 43.5, 44, 44.5 were all sub MOA. I can't remember the jump measurements off the top of my head but I'll measure again and post when I get a chance.
I also made two changes. First, I moved the scope back one position on the rail. It had been right on the seam between where the hand guard meets the receiver. Second, I stopped pressing my cheek tightly against the cheek weld. This helped tremendously in getting rid of "the pulse" as I looked through the scope.