vc -
my friend pete uses 1 1/4 oz #6 shot heavy loads with a full choke on everything from squirrel to turkey which obliterates the smaller birds when he gets on them too fast. it reminds me of when the coyotes gets blasted on bugs bunny, a few blackened feathers come floating down.
i started out with a 20 gauge O/U on birds and that's a great gauge. shot it for years, it was a really nice browning citori lightning. the gun had choke tubes and after fiddling around and listening to everyone (oh, you need full chokes for that"), i found that IC and MOD chokes was the best combo. most birds were taken within 20 yards. i wouldn't recommend a 410 for a new shooter, at 25 yards, like you said it's a stretch and probably too far for it, thats full choked too. my first 410 was a springfield side by side, a good little field gun. that hooked me on the 410, no recoil which meant a fast second shot, you really dont need hearing protection.
i don't have any secret's, other than a lot of birds get away from me (SHHH !!). the 410 is tough, especially on grouse. with pheasant, i have to get on the bird within 5 - 10 yards with a clean head shot otherwise goodbye. i do give up a lot of shots. i also tend to work closely and stick with the dogs. if some dog is ranging, i'm a spectator. if the dogs are tired and bumping i'm a spectator. my favorite dog is a female brittany i've been hunting with with for about 3 years now. we can read each other, she's patient, and she is a just one great pup. i think that, if anything, is the secret to bird hunting.
i guess i like my 410 just because i like it, for no particular reason even. and being realistic, the dogs are more important than the gun, load, or gauge.
carrying my 4(?) pound synthetic handi for half a day isn't bad either, and it is nice to being able to carry a days worth of shells in one pocket, that isn't worth that much, but hey, i'm running out of other reasons !
help me here !
sg
p.s., i still haven't got a double with my 410 handy !, but i'm trying.