Depends, figures I'd say that..
Type of gun ( action ) , how YOUR gun patterns, and the "how the birds fly"
I'm partial to the 2 3/4 dr myself. [ skeet load] It is similar to what I load for skeet. Runs in Semi auto's - my SX1, and will run Rem 1100s, Beretta 302,303 and up. Even Win 1400 semis. -Disregard if shooting a another platform.
[pump/ O/U...] even so soft on shoulder - hard on birds.
The 3 dr [ trap load] is a great load as well , if your gun won't run the 2 3/4 - these should run it.
BTW the 2 3/4 dr Sporting Clay loading @1300 fps is a good one too.
HTH
Steve
I know they make shells other than RED ones....my blue ones are a bit spicer for "just in case"...