HMMMM... I can't find much on this subject. It's the first time I've heard of it as well. Can someone elaborate?
"Front Ignition Loading Technique" OKH, O'Neil, Keith and Hopkins came up with system of loading a cartridge case and found recoil reduction, velocity increase, and muzzle flash decrease. The US Government found out and put them to work experimenting with the .50 caliber case during the WWII. The entire process was kept a secret as the government was afraid the Germans would find out about it. In 1946, after the war, the truth came out. Both Elmer Keith and Rocky Gibbs described the methods and the article shows the work I did duplicating their results. Rocky Gibbs wrote a pamphlet entitled "The Front Ignition Loading Technique". I only know of two copies. The complete pamphlet was republished in the book "Gibbs Cartridges and the Front Ignition Loading Technique."