Some chokes, of course, are more open than marked. And depending upon ammo selection (not talking spreader loads), they can be made even a bit more open. One of the 2 or 3 times I've run a straight at skeet with a gun I'd never shot previously (always shoot low gun, except Station 8) was with a Miroku sxs 20ga, M/F.
The other day, I ran a 75 straight with a Parker Repro 28. I have had the chokes opened on that one, but more for hunting than for skeet scores. (The 28" barrels came from the factory a VERY tight M/F, which would be nuts for grouse & woodcock--
but they're still about skeet/light mod.) I shoot both barrels at all the stations, and I don't think that the tighter choke costs me anything. I do reverse the barrel order on doubles, using the tighter barrel on the first (outgoing) target and saving the open barrel for the incomer.
It's kinda fun, if you have a barrel choked F, to let low 7 get WAY out there and then powder it. But embarrassing when you miss!
