Sam, Could you do me a favor and double-check your case length. With a coal of 3.646, I'm getting a negative shank seat depth from quikload using the standard 30-06 case length of 2.494. If your cases are this length, then you don't have the billet seated deeply enough at 3.646... At least by quikload's figures. The longest cartridge length for a case length of 2.494, is 3.600.
If you could do me the kindness of confirming your powder charge and case length, it would be ver helpful.
Thanks.