I have an AYA 10ga. SxS, 3 1/2" Mag that I bought and used to use, prior to the steel shot requirement. I have yet to decide whether to have the chokes opened up to be able to use steel shot or to go the added expense of Bismuth and leave the chokes alone. I hate to 'touch' the chokes as the gun patterns really well and using the old Federal Premium factory loads or 2 1/4oz handloads you could 'pull'em down' a long ways away.
Something that would help you out is the Lyman Shotshell Reloading Handbook, 4th edition. It contains a lot of good loads for the 10ga. If you're really stuck, give me a list of components you have ie: cases, type of shot and possibly wads and I'll scan some info for you and send it.