Worn on the belt, the RS-20 keeps twenty rounds at the hunter's fingertips. With each cartridge fitting projectile down, into its own recess, ammo is always ready for easy removal. The calibers listed will provide bullet tip protection with very little rattle; however, calibers not listed will fit loosely: .17, .221, .222 Rem. Mag., .223, .256 Win. Mag., 30 Carbine, .35 Win. SL, 6 x47