If you're looking for top end-ish loads you might try 800-x.

I have a 4" 610-3 and have been playing around with 800-x under 180 gr XTP and 175 gr ltc. It's not as flashy as PowerPistol and seems to shoot a little softer (to me anyway).

I can't find AA7 locally, but I have tried AA9. AA9 still had a bit more thump to it compared to 800-x, but I was not able to get complete ignition. I tried running the AA9 up to it's max load, which gave me incomplete ignition and sticky extraction so I pretty much gave up on it.

The only drawback to 800-x is: the flakes are relatively large and it doesn't meter well. I use a Lyman DPS 2 to throw all my powder charges so the metering isn't really a problem for me.