Re: Barrel Bore Curvature
Your question is simple but the answer is much more complicated than "who does what"
"How do you find the curvature?" you look down the barrel either in or out of the lathe.
Your eye needs to be a little trained to do this.
Don't expect to either see a curve, or have a curve that only goes in one direction for the length of the barrel. Every manf. seems to have a different handle on how to create a straight bore, and I'm sure some don't care. I typically use the barrel makers who try and drill nice straight holes.
Now depending on how the smith sets-up, and chambers, the barrrel will determine how effective or needed it is to indicate the curve. Or weather in the end it makes any or no difference at all.
If you ream start to finish with the reamer you may chose one way, if you drill and bore before reaming you may do it the other. Their is a multitude of ways to indicate and cut a chamber. I happen to think my way is the best, thats why I do it that way. Ask any smith and thats likly what he will tell you.
In the end no matter which way it was done, if it was done properly the difference in the guns ability to shoot will likly be more effected by other things in the process of the assembly, components and implementation.