Mountain Man Gramps

I'm going to start reloading shotgun shells for cowboy matches using my Lee Load-All. I've reloaded some shells using blackpowder but what recipe and powder do you recommend for 7/8 oz of #8 shot using smokeless powder? What about the about the wad? This is my first time reloading smokeless shells and I'd like to replicate the performance of Winchester's AA Low Noise/Low Recoil shells. Thanks in advance!