yeah i wouldnt use it man. The problem with the can being labeled "wichester ball" is that winchester only makes about a half dozen different ball powders. And the real danger is if you assume its say W748 and try to load a full case of .308, say somewhere around 45 grains of it, and it is actually W296, youre probably going to have a 'rifle grenade' go off in your face. W296 and W748 look identical to each other, as does W760. they are all 3 very fine spherical propellants. And 3 very different powders
Stay safe and sprikle it on the flowers. at most youre out 25 bucks for a new, known, safe pound of powder.