You posted while I was typing earlier. I read the question, did a little research and posted. When my answer posted yours was there already.

But ya, that is what I got out of it as well. They don't flat out say it, but it seems like a pretty sure bet that is what they did. Just took the existing bullet they had for the S&W round and stuffed in a shotgun shell. I believe they also offer it as a 54 cal options for the ML's.

Paul