2520 One of the most popular powders of all time, this medium-slow burning, Spherical propellant gives excellent results in medium capacity cases (308 class) and certain applications in large bore cartridges. This powder was in the winner's circle in NRA High Power competition before it had been on the market two years! 2520 is the first choice for target shooters using 168 grain bullets in the .308 Winchester. 2520 has a pressure curve appropriate for use with M1 and M14 (M1A) service rifles. In fact, some shooters now call it the "Camp Perry" powder.