I bought my Browning 1885 with Weaver bases and it was drilled and tapped from the factory. I had to shim the front one about .050" to get everything working, but there is plenty of eye relief and plenty of range in the windage and elevation adjustments. I'm using a Weaver V24 on it and love it. I wonder if the traditional hunters were drilled and tapped; maybe that's what we're talking about here?
RonF