Hi!
Think you could try 165 Accubonds and might not have to switch back to 180 anythings. Not much wrong with the Sierra and Hornady from an '06, however. Try 57 gr IMR 4350, or 58 of H-4350. Rl-17 and Hunter are also good. The old Springfield is mighty good at a whole lot of things, and I, for one don't see the accuracy issues that some people claim it lacks. This is true with several rifles.