Re: military surplus powders
My 223 and 308 loads have been based on Wideners IMR4895 for quite some time.
69gr SMK (and 68gr BTHP Hornady) + 24gr 4895 at mag length, different loads for 308 using Scenars (155 and 167) and SMK.
Now I have only non-suplus 4895, but I wouldn't have any problem trying it again.