No military powder is the same as commercially available powders, the military uses what is referred to as non-canister grade powders and they test each lot for performance requirements. If the powder meets their performance requirements then they use it, if not then they reject it and go on to the next powder. We have access to commercial powder (canister grade) that is not screened the same as military powder. Commercial powder will stay pretty consistent in regards to their burn characteristics while the military will adjust those characteristics from time to time as the need arises. As a result, military TM data is based on some standard that was developed many years ago and it may not be consistent with the commercial powders that we use today even though they use the same general brand name for the powder.i guess i missed the "h" part... how is imr 4895 not a commercial powder? am i missing something? i have a few pounds of it. not trying to be a smart @ss, im just curious
The bottom line is that when we try to build ammo to military specs we can't guarantee that we will get exactly the same performance, even if we use military surplus powder and components. All published load data should be worked up to under safe, controlled conditions until the load is proven to work properly and you may end up with slightly different load specs while achieving the same kind of performance.