Mossberg 500 or a Browning 12 gauge.

Browning Gold 12ga, mod. 2 3/4 #5 or #6

12 gauge O/U or double with IC/Modified chokes.
1 1/4 oz 6s when I shoot lead, which is rarely.
1 1/8 oz steel 3 or 1 1/4 oz. Kent Tungsten-Matrix 5 or 6 for non-toxic

My Browning Mod.2000/12Ga,23/4" Mod/Chock with a Mix of #71/2,#6,#6.

I use Browning A-5 Light 12 with modified choke and Federal Hi-Velocity #6 shot. I think things are going to change this year though. Turns out my eyeballs are quite fragile (in addition to fragile retinas) so I have been ordered to acquire something with less recoil to hunt geese (I use 3" 870 shooting hard-kicking very high velocity steel). That Light 12 belts me pretty good shooting those loads. Also, for shooting over the flushing labs that gun and shell combination was excellent. However, my Brittany pup is really coming into her own so I'm thinking I'll need a more scattered pattern for closer shooting.

20 ga O/u, or same ga. autoloader, and 1 1/4 oz. of 6's. Make the bird be in range, and get out front...dead ringneck.

Beretta 686 Silver pigeon 28 ga O/U with WW 1 oz loads of #6 shot will kill the biggest rooster if I am on target. OR my 687 EELL 12 ga with 1 oz loads of #6 or 5 shot with same results if I do my part.

Dakota, I think you mean 2 3/4" shells? The only 2.5" shells I have seen were collectibles.

You do make a good point. A 20 or 28 gauge may do the job fine IF you're hunting over a pointing dog and the birds aren't too spooky yet. But those who hunt over flushers (e.g. labs or springers) can expect longer shots. On the federal refuge I will switch to my goose gun because the birds are so spooky long shots are about all I'm going to get. But for hunting the irrigation ditches and canals on block management I'll go back to modified. The way this pup is working out I'll probably shift to improved cylinder but I think I'll stick with 12 gauge. That way I can use the same gun for goose and pheasant hunting. Last year I'm guessing I shot at least 35 roosters and only mangled two of them and one of those the last day on the federal reserve with the full choke 870 and 3" mag (all I could get in steel at the end of the season). He doubled back from the dogs right past me before getting up. Shooting off the wrong foot and turning, that was a tough shot. I should have waited but figured it was going to take more than one round to connect anyway. Poof! Wouldn't have got the second shot as the 870 jammed ejecting the 3" shell (as usual!). I must say, however, that I believe the biggest reason I wasn't blowing up the birds was I just wasn't shooting very well. Very rarely did the birds pick up more than a couple of pellets so usually just the edge of the pattern. One of my late son's special needs teachers is after me to join the local trap club. Maybe shooting will improve this fall. I'm not in any big rush to see things change though. I like to take my time filling my limit. As much time as I can.

20 ga s/s CZ + prairie storm

Ithaca is right, when hunting the federal refuges and compelled to use steel shot it is best to bump up a couple of shot sizes. I'd use #4 or #5 shot and definitely a 12 gauge.