Brent,
Glad you are intact and basically all right. Sad to hear about the rifle. I remember it, as it one one on my list of possibles. I agree about low/high discussions. One thought crosses my mind, and I haven't messed with cast bullets for a few decades so this is a SWAG; could that charge create an effect similar to the mystery blowups caused by bullseye in 38 special loads? powder shifting and airspace combining to sometimes go boom? Just a thought.
Thaine

It ain't ignorance that does the most damage, it's knowing so derned much that ain't so! J. Billings