Aquila has introduced a mini shotgun shell which it markets as the MINISHELL. This is a 12 gauge shell available in a slug, buckshot and 7-1/2 birds shot. The shell is 1-3/4 inches which essentially doubles your tube capacity. The slug version is pushing a 25-gram slug at 1,250 ft./sec with less recoil than its 2-3/4 brethren  for faster target acquisition.