United States, Regions, Divisions, and States: 1900 to 1990 [TXT] United States: 1790 to 1990 [PDF] NOTE: An error in the 1960 rural population count was discovered after the publication of CPH-2-1 from the 1990 Census. The correct 1960 rural population using the 'Current urban definition' is 54,054,425.
Shotgun Choke Tubes: A choke tube is; a removable interior tube at the end of a shotgun barrel that controls shot dispersion. Choke tubes typically come in cylinder, improved cylinder, modified, improved modified, full and extra full.A cylinder choke tube produces a very wide shot dispersion, whereas a extra full choke tube will provide a much tighter shot pattern. Different chokes are used for skeet, trap, and sporting clays.hoke tube selection is a confusing issue amongst a lot of shotgunners but one that is easily explained. Everyone knows how to pattern a shotgun and what they are looking for, which is the ultimate full choke pattern at 40 yards, which is a 70% shot pattern, it is this area where it all gets fuzzy and needs explaining.
You can shoot any type slug out of a smooth bore barrel, but there is debate on accuracy when using a choke or rifled choke. A Foster slug or what some call an America slug, is designed for a smooth bore barrel. The slug has a deep hollow in the back that allows the center of gravity to be in the front.ou can use Sabot slugs in a non-rifled barrel but accuracy and range is diminished. Some weapons allow you to switch barrels, so you can have a smooth bore for lead non-rifled slugs and birdshot and then change out for a rifled barrel, for greater ranges.