I patterned my shotgun on the weekend and was getting very tight patterns at 21 yards, so I measured the constrictions with a bore-gauge and calipers - here's what I have:
1. Full - .382" - .028
2. Imp Mod - .387" - .023
3. Mod - .390" - .020
4. Imp Cyl - .395" - .015
5. Cyl - .399" - .011
Kinda tight...
Anyway, I phoned Savage to see what options they have - and they want the whole gun and chokes shipped to them. I'm not in the mood for all that, so I ordered a few of their in-stock chokes which, if they're not already closer to spec, I can attempt to modify myself with some sandpaper/dowel.