I've started pretty much a scratch build for a .50 caliber cap lock pistol. The barrel is being made out of a 1 inch piece of stainless steel round stock which I'm hogging out with a 1/2 inch drill and following up with a clean up using different grits of paper. Bore length will be around 10 1/2 inches which is the length of the drill I'm using. I'm not drilling through and installing a breach plug, just dead ending the bore and leaving plenty of metal at the breach.
Just for hoots and hollers I'm making a rifling jig out of some of the stuff laying around the shop and plan to use it on the barrel. I'm getting ready to coil and weld the 3/16 round stock around the control cylinder and am wondering what twist rate I should use. Most of the pistols I own are either smooth bore or a 20 inch twist.
I'll be shooting PRB with this gun and since it's my first attempt I would like to try to get it right. Don't even know if the build will work, I need to convert one of those 60's crappy Japanese flintlock actions I've had sitting on the shelf for years over to caplock unless I can track down a decent one at good price.