I have been very happy using Ramshot Competion powder. It meters consistant thru a univeral charge bar. Have shot it in various weather from 5 degrees to 80 degress and havent experienced any bloopers or change in performance. Targets seem to break very well and it doesnt pound my shoulder. I have been shooting sporting clays with it. 18.5g gunclub hulls 1 oz 8 shot green duster wad win primer. Burns clean.
I really liked it, but it is hard to find and pretty expensive compared to other powders. If you have a good economical, access to competition powder, buy it and use it. I sure would. Let me know who your source is too.