szihn,
Thanks i was concern because I have not experience with muzzleload double rifles.
I have a bullet move on my double 577 snider once, but was because I was not using any crimp.
I would like to know about your proyect.
Im in a trade for a Kodiak .58 and I also have plans of making a doble .500 in a "in-line" configuration.
Thanks
Martin