I just recieved the gun yesterday. It is a Stevens 5100 with 28" barrels in excellent shape. From what I can find out about these guns they were supposedly made in the 1930's and 1940's. I checked the chokes with a choke guage and they measure Mod & I.M. I am sure they will probably shoot tighter with today's ammo. So what do you think, have the chokes opened or leave them alone?
Mod & Full would probably be just fine for wild birds when using flushers and shooting lead shot. However, no one has mentioned the issue of using steel shot in that gun. I'm sure it's a big no, no! I have a 1960 Sweet Sixteen that is choked IC and the use of steel in it is not recommended. So I'm not sure even if you open it up to IC/Mod whether you should use steel shot in it. I've bought some Kent Tungsten Matrix to use in my Sweet sixteen.
Zeb, I have a 16 ga. Citori I can use if I am hunting an area that requires non-toxic shot. I would also use the Citori if the birds were consistantly flushing closer since it has interchangeable chokes. I definately would not shoot steel through the Stevens. I bought the Stevens for nostalgia's sake as I had a Stevens 311A 12 ga. long ago that my father bought me for my first shotgun, but man that thing was a club! I also have a Ithaca model 37 in 16 ga. with 28" barrel choked Mod. I am 59 and the older I get the more I appreciate the older guns for upland hunting, especially in 16 ga.
I am the odd man out here I guess...I tend to prefer more open chokes, and I also hunt over flushers...frankly, I am not a great shot, so the open tubes help me with those closer shots evidently. I have 2 16 ga. S x S guns...both are sk1/sk2...I have 1 20 ga. s x s ...it is IC/M....my last hunt of 2012, which was in late Dec., I shot a 20 ga. auto, and had a cyl. tube in...bottom line, whatever works for you. The late Michael Mcintosh suggested that most shooters were probably better off with virtually no choke at all...cyl was his suggestion, I believe....I have definitely noticed it to be helpful to me, but we are all different in our shooting. Good luck!