Don't forget to pattern your loads too, steel is definitely tighter than lead so your usual Mod becomes IC and Full becomes Mod. This topic gets a lot of discussion at times on those sites as guys making trips out of state want to pheasant hunt a little when done duck hunting......
Yes, pattern your gun/chokes at the distances you plan on shooting your birds.
I try to set up my O/U chokes so one barrel/choke is giving good 30 yard patterns and the other barrel/choke is good for shots out to 40 yards.
Here are some of my 20ga pattern numbers to give you an idea of the kind of pattern density you can get from a 3" 1-ounce loads of steel No. 2s & 3s.
Pattern results from a 20-gauge Browning Citori with 28" Invector-plus barrels and Briley flush chokes to give you an idea of what you might find (patterns average of five, 30" post-shot scribed circle, yardage taped muzzle to target, and in-shell pellet count average of five).
20 GA 3" WINCHESTER DRYLOK STEEL LOAD
1 oz #3 steel (145 pellets) @ 1,330 fps
30 YARDS – SK / pattern 114 (78%)
40 YARDS – IM / pattern 106 (73%)
20 GA 3" REMINGTON NITRO-STEEL LOAD
1 oz #2 steel (118 pellets) @ 1,330 fps
30 YARDS – SK / pattern 101 (86%)
40 YARDS – IM / pattern 99 (84%)
Here are some of my 12ga pattern numbers to give you an idea of the kind of pattern density you can get from a 2 3/4" 1 1/8-ounce load of steel No. 2s.
Patterning results from a 12-gauge Browning Citori with 28" Invector-plus barrels using Briley flush chokes (patterns average of five, 30" post-shot scribed circle, yardage taped muzzle to target, and in-shell pellet count average of five).
12 GA 2 3/4" REMINGTON SPORTSMAN HI-SPEED STEEL LOAD
1 1/8 oz #2 steel (139 pellets) @ 1,375 fps
30 YARDS – SK / pattern 116 (84%)
40 YARDS – M / pattern 114 (82%)
Good luck.