More about Mare's Leg
here.
New term to me, "mare's leg", although I have referred to single-action Colts as
hoglegs for at least sixty years. I guess I'm the only citizen who hasn't heard the term before, but I don't watch television. Ever.
The Mare's Leg doesn't look like much of a varmint gun to me. Varmint guns usually are something between a heavyweight hunting rifle and a benchrest rifle. Use'em for popping prairie dogs at 300 yards. Some Mare's Legs, according to the articles I just read, don't even have sights.