05-10-2014, 05:56 AM
In 2009, there was a presentation given at the National Defense Industrial Association (NDIA) conference that had a section about the development of the MK 248 MOD 1 .300 Win Mag cartridge. The presentation includes some comparisons of this new round (using a 220 gr Sierra Matchking) vs. a couple of .338 Lapua loadings.
The presentation also discusses the development of the 7.62x51 MK 316 MOD O sniper load. Eventually it was discovered that the propellant chosen for this cartridge is good old IMR 4064. Although this powder has been around for decades, it is very temperature stable.
http://www.dtic.mil/ndia/2009infantrysma...ii8524.pdf
The presentation also discusses the development of the 7.62x51 MK 316 MOD O sniper load. Eventually it was discovered that the propellant chosen for this cartridge is good old IMR 4064. Although this powder has been around for decades, it is very temperature stable.
http://www.dtic.mil/ndia/2009infantrysma...ii8524.pdf