I still have some of the original left over from an 8 lb keg I bought years ago from either Powder Valley or Wideners. It works well in the .223 Rem with 55 gr bullets, good velocity and accuracy. It was surplus, but apparently enough people liked it that it is now being manufactured and sold as new. If I recall correctly, it was originally manufactured for use in the 5.45x39 and was considered to be a little on the fast side for optimal use in the .223. Probably not the best choice for heavier than 55 gr bullets. I have since gone with Ramshot TAC for the 40 to 50 gr bullets in the .223 and Varget for the 55 gr and up.