Specific cartridge loads need specific propellant to perform to their ballistic peak. That’s why Alliant Powder put countless hours of research and development into creating Reloder 33. The advanced powder is specifically formulated for the long range of large magnum rifle cartridges .338 Lapua, although it is also ideal for a range of large magnum rifle cartridges. Its double-base gives it consistant performance across temperature and humidity extremes, and it meters well for easy and precise loading. Specifically designed for the .338 Lapua. Also suited for a variety of large magnum rifle cartridges.