One of the Gun Digests from the mid sixties had a small note about making a vee block, with the algebraic formula for measuring bore slugs from a barrel with an odd number of grooves such as a S&W revolver or an Enfield rifle.
I thought it would be useful to make one for a few reasons:
1. It would see occasional use.
2. I'm frugal, (frugal sounds so much better than cheap).
3. I have a vise, files and some scrap steel to file one out of; plus I enjoy making my own tools when possible.
Unfortunately I cannot find the book. I have it, and I know I have it, I just can't find it.
From what I remember, the angle of the vee is supposed to be 108 degrees, true? It shouldn't be too hard to layout with a protractor and a square.
Does anyone know the formula, and would you mind posting it?
Or does anyone know for sure which year it was in? I think it was somewhere around 1965 or so, give or take a few years.
Also, is one block at 108 degrees useable for multiple numbers of grooves such as 3,5,7, or do you need a different angle for a different number of grooves?
Thanks for the help,
Robert