You might follow Dennis' suggestion and take a look at the Rice drawings.........they were copied directly from our catalog
and we were the ones to design them originally. Although the A weight is usually only done in calibres up to 40, we have done some in 45. I have also found that a B weight in 50 is a rather light barrel, especially in the 38" version.
As for that 13/16" straight barrel in 50 cal., I didn't know anyone else was making them. When we first made them,
everyone screamed that they were too light, and not safe to shoot. What the heck, we proofed them with 300 grains of
FFF, double balled, without harming the barrel, gee whiz, what do you want. Ed Dillon just picked up 6 of them the other day from John. The one precaution you have to take when using a barrel of this size is the depth of your dovetails,
you must use a little discretion here, and it also a little too thin to use a touchhole liner. As for me, the barrel is too light
for any serious shooting...........Don