Question: what is the difference between full modified improved cylinder chokes?
Answer: Types of Tubes For example, a full choke is most effective at 40 to 50 yards. An improved cylinder is most effective from 20 to 35 yards. ... Modified: This choke has less constriction than a full choke, delivering approximately 60 percent of a shell's total pellets in a 30-inch circle at 40 yards.