Fast-burning, single-base, extruded rifle powder Accurate 2015 excels in small- to medium-sized varmint calibers (223 Rem, 204 Ruger). For exceptional performance in benchrest calibers, 2015 is a popular option. It is also advised for use in large bore straight wall cartridges (45-70, 458 Win Mag). 2015 offers excellent ignition characteristics and shot-to-shot consistency.