Downloading Magnum Pistol Powder

[Messy bear]

In post 16-
Some are better at downloading. The ones with less deterrent will ignite easier. Number 9 is better than enforcer in this regulars
If you down load, try to use powder with less deterrent, use bullet with more shank, use as hot a primer as possible, and make sure to have good neck tension. May have to experiment with different size dies.
Then use a chronograph and test 5- or better yet 10 and look for extreme spread of 100 FPS or less.

[uscra112]

I believe that one of the mechanisms for an"explosion effect" to happen is to have the primer firing drive the bullet into the lands, and then have the powder fully ignite after a barrel obstruction has occurred and some amount of powder being partially lit and left "smoldering", OR for the powder partially ignites and the bullet fails to move and powder gets packed into the case neck or perhaps the bullet moves into the leade where pressure required to move the bullet rises from rifling engagement, and then the powder completes ignition and the pressure rises rapidly to dangerous levels.

^^ This is correct, and has been reproduced in a lab, albeit with a 6.5mm rifle cartridge.

The idea that smokeless powder can detonate is purest hogwash. The chemistry is all wrong. Blowups of light loads in revolvers are double charges, no question. Nobody likes to admit they screwed up, so it gets blamed on something - anything - else.

Finally, we shooters of old single shot rifles use light loads of magnum pistol powders routinely, at load densities of 50% and under. Blue Dot, 4100, 4227, for example. One my pet AA#9 loads for the .25-20 Stevens is just over 40% load density, and it shoots just fine. We don't crimp our bullets at all, btw.