Coincidentally, I have had two of my 30+ year old former across-the-course 223 rifles with Krieger barrels, re-fitted with picatinny rail uppers instead of the old hand-grip, attaching cantilever sight mounts for Vortex 6-24 Diamondback FFP Tactical scopes (yes I know that they are not the sharpest, but I love the "Christmas tree pattern), used an old throat reamer to hopefully allow my ammocan full of 80-grain Sierras to be pushed out to maximum length, installed thick ERGO handles, and Magpul competition AR rifle stocks. I have found that my 30-year old load with VVN550 is too slow to get the case expanded due to sooty surfaces. I have some 25-year old VVN540 which I will use with the 223. Both powders remain good as they have been refrigerated in the summers. I use the VVN550 in 180-grain 308 loads and with 6.5x47 loads. The 308 is my chief deer gun with close to MOA capability, so the powder "speaks for itself". In this day of absurd powder prices, I got about 2-dozen 2-pounders of both powders as a close-out from a dealer at the end of the last Camp Perry match that I attended in the late 1990's for less than $20 each.