Greetings @Scout,
If I may offer some words of caution about AR2201. AR2201 was replaced by AR2206 around 40 years ago. The Oz Army found that AR2201 produced variable port pressure in the 5.56 and had a poor shelf life especially at high temperatures. Mulwex developed AR2206 which was the first of what was later labled by Hodgdon Extreme powders. Mulwex never manufactured AR2201 as a canister powder for direct sale to the public only offering it to ammunition manufacturers like CAC which packaged it and sold to the public. For this reason load data is variable. I don't doubt for a minute that you are getting excellent results from some carefully stored AR2201 but you may wish to consider using AR2206H which should give as good or perhaps better results in your old girls. This is what I do in my old soldiers. To me using AR2201 with an unknown storage history creats an unneccesary risk.
Regards Grandpamac.
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