[tet68]

I've been thinking of buildiing a 40mm blackpowder rifle
I mean muzzle loader, black powder, what could be wrong with
that?

[Vinnie_Vidi_Vici]

I've been thinking of buildiing a 40mm blackpowder rifle I mean muzzle loader, black powder, what could be wrong with that?

A gunsmith in Arizona was building muzzleloaders made from shot out 20mm Vulcan cannon barrels He cut out the part with the chamber throat erosion and had four feet of good barrel to work with. I suppose you could fins some surplus 25mm barrels from the Bradley fighting vehicles and do the same.

[libstripper]

Nothing, aside from your missing shoulder after you fired the first shot from your 40 mm (about 1.7 in.).

[Redbob]

"I've been thinking of buildiing a 40mm blackpowder rifle I mean muzzle loader, black powder, what could be wrong with that?"

Can I watch when you slap it to your shoulder and touch it off?
Should be interesting!