Depends on what you're shooting over pointing dogs. I've shot a bunch of wild pheasants, having lived most of my life in Iowa and having had a fair amount of time available to hunt them--and just getting them pointed is only half the battle. The other half is having them sit until you're within range. I prefer a double with not much choke in the first barrel for that kind of hunting, but at least light mod in the tight barrel. I used to have a pair of Brit 12's, the #1 gun choked that way, and #2 choked skeet/IM for later season birds or those days when they're a bit wilder. The vast majority of my first shots come inside of 30 yards, and I think it makes sense to have your gun choked (at least in one barrel) to deal with the majority of your shots. But it's also nice to have something tighter for the longer chances.
Re chokes for blockers, I think it depends on how far apart they're positioned. Midwest pheasant country is mostly flat, which means the birds in general aren't going to be extremely high, although shots might be long laterally if the blockers are spaced widely. A good friend has a McKay Brown OU choked .010 in both barrels, for driven birds. That's not specifically for the shoots with the very tall birds, and it's a bit tighter than Dig's chokes. But it takes considerably less to kill pheasants shot from the front or as crossers--the shots that blockers get on field drives in the States, or that guns get on driven shoots abroad. And due to terrain and vegetation (trees), British driven birds will often come over the guns a good bit "taller" than they will over the blockers on an American-style field drive. 2 1/2" 12's, shooting no more than 1 1/8 oz (and often 1 1/16 oz), work quite well on driven shoots that don't specialize in "archangels". For that matter, I use mostly 1 1/16 oz Brit 6's in my first barrel for wild, walked up roosters over pointing dogs. There seems to be a mania for heavier and faster pheasant loads these days, but Hill, Brister, and McIntosh all pretty much agreed on 1 1/4 oz 6's at around 1220 fps as being maybe the best all-around pheasant load. Given that roosters have not taken to wearing Kevlar, nor are they any faster than they used to be, I think most folks would do just as well with lighter and/or slower loads than what American ammo companies are now touting as their best pheasant loads.
