No data or details. Saw this photo on line from someone who obviously exceeded pressure limits. The point to be made, the .45-70 Marlin, due to a relatively thin barrel at the threads and the way the receiver is made, has a weak point where this one blew, right side, just ahead of the ejection port. The .444's have more steel around the case due to smaller diameter. I've not seen reports of them coming apart like this.
DF
Have a buddy that shoots a Marlin in 45-70 he's never had problem one and several guys at the range as well. They us a little faster powder for most of those loads. My guess is someone way way over MAX! You can blow up the strongest bolt gun with enough powder you see pictures of them all the time.
