Many years ago when I worked as a dental assistant, we used something we called "Gelfoam" to pack into sockets after extractions to stop bleeding. I don't know if that was a generic term or the porduct name. It seems that something like that - a more solid, spongy substance, would be a lot safer than a powder that could blow around or be spread. If "gelfoam" would be practical for a large wound, I don't know.