I do the same as ajax, doubles are the most fun.I'm right handed and I shoot the straight away(right) from 1-2 and the right target first from 3. Then back to the straight(left) from 4 and 5.
I've found I like Imp/Mod for the first barrel and full for the second.
Others shoot them differently. Try some and find out how you like them yourself.
Don't fall into that trap. pick one load and use it for both. Too many start out trying to out think them. Just shoot them and stop worrying what you are using. If you miss, it's you, not the choke or the shot size. There is no magic, no pixie dust.I've shot doubles once and expect to shoot doubles every week or two. Shooting with a semi auto, I'm thinking about an IM choke but I'm wondering if I should mix shells and shoot 8's on the first shot and 7 1/2s on the second shot ... any feedback on this approach?