If you want 6.5mm have you given any thought to .264 win mag?Performance leap from the 6.5x55. Could load itup with a Barnes TSX 120 or 130 gr bulletand have no problems taking blackies or calf moose.

The 2506 with 26" tube is a real gem as well. If you used a 115gr barnes or 120 partition it would also work for other then deer sized game. Though with what you have already doesn't seem like much of a concern!