Mark;

The convergence angle of double rifle barrels is not an exact science by any means, and to me is largely a matter of experience. On this particular rifle I converged each barrel to the center line of the distance between the firing pin holes at about .040" at the muzzle of the 22.5 inches of barrel length--meaning that the center of the bores are .080" nearer each other at the muzzle than at the breech. This is a good topic for you to research with some of your current colleagues.

One of the members of this forum, Ron Vella, has built about 6 double rifle using Brno zp49 actions and I hope that he will provide input as to how he came about deciding on barrel convergence, as he is a expert at it.

I will remember to discuss the jointing of the barrels in future posts.

Thanks;