Being a double barrel has no bearing on what the choke COULD be. While MOST are full/ modified. it could be any, or none. Shotgun ChokeYardageShotgun Choke Restriction
Diameter difference between bore and shotgun chokeCylinder< 200Skeet22.5.005 of an inchImproved Cylinder25.010Light Modified30.015Modified32.5.020Improved Modified35.025Light Full37.5.030Full40 or More.035Extra Full40 or More.040
They probably denote what choke the barrel has.
No way to answer without knowing barrel length and gauge.
A barrel with a full choke.
Barrel marking include the proof marks, choke code and weight of the barrels. Please be specific and we can give a more direct answer.
A shotgun barrel with a cylinder bore choke.
What specifications do you need? Barrels differentiate depending on length and choke. The weight depends on the barrel as well.
If you mean a choke bored barrel, it designates the amount of constriction a shotgun barrel has.
They came in various barrel lengths and choke combinations. If it is not marked on the side of the barrel, you will have to pattern the shotgun to determine the choke
It is possible to fire a shotgun without a choke, but it is highly not reccomended, and they don't cost that much If you select a barrel with no choke (cylinder) it will cause the pattern to be looser than for a barrel of a shotgun that has a tighter choke. The extreme is "full choke" which keeps a tight pattern out to the effective range. Full choke is typically used for waterfowl. A shotgun that is pressed into double duty (shot for small game and slugs for big game) would work well to have modified choke. Slugs have to be designed to fire through a full choke without blowing the barrel but you will certainly shorten the life of the barrel by firing slugs through a choked barrel. If you can afford an extra barrel, then use a cylinder (no choke) for slugs. Remington and other shotgun manufacturers have interchangeable choke tubes (see link) that allow you to screw in the appropriate choke for your quarry.
no you cannot. sabot slugs are made for rifled barrels. I would buy a rifled slug barrel.
Degree of choke
http://www.gunshop.com/dgsnos3.htm