AR-15 shooting a 5.56 55gr bullet at 3lbs of Sonic Boom that I picked up at Cabelas when it was on sale. Initial shots at 1lb of Sonic Boom didn't ignite; that may have been due to the small container that didn't allow for good mixing of the compounds. However, when mixed with another pound of the compounds, along with a pound of the .22  Sonic Boom, it worked quite nicely, making a large mushroom cloud that sadly isn't visible in the close up video here.