Thanks, Albert. I always enjoy your posts. Here are some test targets at 50 yards with the .58 Hawken I built with the Track "Fixed Sight with Peep". If anyone is seriously interested in this sight, I would modify it. Just ask how.
Here is the owner with some test targets (different loads) at 50 yards.
And here he is in action. (He is an eye doctor, subject to call, thus the cell phone).
David R. we haven't addressed your original questions much. Here are some Track of the Wolf sights (go to their web site if you don't have their catalog) that might work for you. RS-PA-16 "Semi Buckhorn rear sight", RS-G-352 "antique stye rear (semi buckhorn)". Either of those could be drilled with a round hole like I did on my RS-DRU-1 "1770 Lancaster" sight.
. A front blade of .060 is thin, .090 is fat, sight FS-PA-37-B(brass) or I(iron) at .076 might be good.
This is "Tennessee sight" FS-FG-40-I, and I like it. .064 thick, I shortened the nose.