I don't think it will change the powder burn rate; no different than shaking a half full can of powder. But it doesn't take an oxymoron to see the danger - point of bullet strikes primer, or side of a rim strikes primer. Is it worth the chance? Don't do it.
I assumed there was a danger factor, ergo the question.
Thanks for your post.
Had read somewhere that someone had done it, and something just didn't seem right about that, so wanted to ask what others knew about it.
Following their reasoning, I'm assuming ammunition should not be shipped by truck either, since the vibration of the truck driving down the road will cause the powder to deteriorate. This would also hold true for gunpowder. The whole industry is unsafe!