No clue other than I've been told you shouldn't. I have found absolutely no data for smokeless in brass. As I said I have proceeded VERY carefully. I'm quite familiar with pressure signs in center fire rifle and pistol ammo and have watched carefully for any indication there might be the slightest issue.
In this case, I believe Bruce is referring to the fact that black powder is done by volume not weight. The same volume of smokeless as black would certainly be a serious issue. My suspicion is some of the old burst barrel horror stories involved charging a gun with the same volume of smokeless as one would use with black powder.
Thank you, Bruce, for the loading info. Is there a "best" among the black powder grades you mention for this load? Don't the different grades burn differently?
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