rifle detonation again

[Don McDowell]

The amount of 5744 necessary to replicate Black Powder velocity
is 25 grains or less. So indeed a double load could fit in 45-70 case.
.

I'm not particularly interested in defending smokeless powder used in a blackpowder designed case/firearm. I am interested in actual fact, and not to wild about somewhat bogus info being posted.
So with that said, even a "ruger" only charge drawn from one of several loading manuals with a 500 gr bullet runs at or around 38 grs of 5744, that charge amount fills a 45-70 case to within 1/4 inch or less of the base of most any 480-540 gr grease groove bullet. So it becomes quite apparent that when someone is using the often recommended 25 gr charge in a 45-70 a "double" charge isn't going to fit without even the least observant of reloader discovering the over charge when seating the bullet.
This incident was most likely caused by the use of a wad to hold the powder down over the primer. Something that all the loading manuals, and the powder manufacturer says not to do. The pressure spike caused by that, just so happens to take place at the thinnest portion of that particular rifles barrel.