It all takes practice -- and sound fundamentals guys !!
These days I'm in the low 90's on Skeet and Trap ....and usually in the low 80's on sporting clays..../ and its not about shooting 1 1/8 oz loads at 1300 fps either.....its about "feel"...reading targets, consistent stance, good mount, good fundamentals shooting sustained lead most of the time....
In a 12 ga I never shoot more than a 1 oz load at 1225 fps....in 20ga 7/8 oz at 1200 fps ...in 28ga 3/4 oz at 1200 fps...( and 1/2 oz at 1200 fps in .410 )....my best gague, by far, is my 28ga...so its not about how much shot is in the air....
My buddy that shoots a .410 very well ....in the low 90's ( shoots it just as if it was a 12ga )....in the right hands, a .410 can do very very well....but it has a smaller pattern in general ( usually about 18" vs a 30" pattern for 12ga, 20ga, 28ga....) with the right choke.
My .410 / 28ga / and 20ga....are all Browning Citori XS Skeet models Over unders with 30" barrels...they are all built on the 20ga receiver...so they're virtually identical...so my lack of success with the .410 is mostly mental...but good shooters can overcome that.../ I can't --- but good shooters can ...
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All of my primary guns for Sporting clays, Skeet, 5 Stand and upland birds ....are all O/U's with 30" barrels because its what suits me...but everyone should shoot what suits them ( 8 1/2 lbs suits me the best )...with parallel adjustable combs.
For Trap ....I go with an O/U with 32" barrels ...at about 10 lbs...( Citori XT is my primary Trap gun / I have a single barrel BT-100 - its a 32" as well / but I don't like it as well as the heavier O/U )...