Bore is the number of lead spheres the diameter of the barrel it would take to equal one pound. Ergo, the larger the bore, the smaller the barrel.
Bore shotgun is the way forward.
A shotgun barrel with a cylinder bore choke.
A shotgun with a 40 mm bore would correspond to a 10-gauge shotgun. The gauge system is inversely related to the diameter of the bore; thus, a 10-gauge shotgun has a bore diameter of approximately 0.775 inches (19.7 mm), while a 40 mm bore exceeds the common shotgun gauges. However, 40 mm is typically associated with larger caliber weapons rather than standard shotguns.
A muzzle loader shotgun
both barrels are not choked
The bore of a shotgun barrel is specifically designed to accommodate the size of the shotgun shell and its intended projectile, typically a wad or shot. The diameter of the bore determines the gauge of the shotgun, which influences the type and size of shot that can be used effectively. A properly sized bore ensures optimal performance in terms of accuracy, range, and pattern spread when firing. Additionally, the bore may be designed with specific features, such as choke constrictions, to enhance shooting characteristics for different applications.
Depends on how old the shotgun is.
0.729 inches or 18.5 mm
Yes
The CBC MODEL SB 410 BORE SHOTGUN is made in brazil and imported by firearms import and export Corp. located in Miami, Florida it is a break-action single shot shotgun
The nominal bore size of a 12-gauge shotgun refers to the diameter of the shotgun's barrel, which is approximately 0.729 inches (18.5 mm). The "gauge" system measures the number of lead balls of the bore diameter that can fit into a pound; thus, a 12-gauge shotgun is designed to accommodate 12 lead balls of that diameter. This measurement influences the shotgun's performance, including its shot pattern and recoil.
This is a shotgun with an internal barrel diameter (called the "bore) of approximately .410" which shoots a shell which is about .410" in diameter. It is the only shotgun shell size that uses this convention. A 12 gauge shotgun, for example, does not have a bore of "12". A 20 gauge shotgun has a smaller bore than a 12 gauge and a 10 gauge has a bigger bore than a 12. Gauge size is based on the number of lead balls of the bore diameter which are required to make a pound (16 ounces). 10 balls, 12 balls, or 20 balls.