
http://www.midwayusa.com/product/497701 ... inum-matte
The one in question has a Skinner rear sight at its lowest setting, and is shooting 18" high at 50 yards with 240 grain JSP Winchester factory loads.
The current front sight is 0.25" tall from dovetail base to bead.
18" high at 1,800 inches (50 yards) means that the sight needs raised at 1:100 versus the sighting radius of about 22 inches, so the sight needs to be (at least) 0.22" taller. Each 0.01" of sight movement translates to about 0.8" at 50 yards.
I've not found a 1/4" wide sight that is 0.47" or 0.50", and thought about:
- a) replacing it with a 0.50" tall one that is wider, and filing off the sides flat to fit the 0.25" ramp
b) replacing the ramp with a wider ramp (if I can find one with holes matching the factory one)
c) using this riser plus the original 0.25" sight, or
c) using this riser plus a 0.29" tall one that is 0.25" wide
The 0.29" one would give a bit of adjustment room for different loads, by bringing impact down about 23 inches instead of the 20 inches I'd get from just using the original 0.25" one.
I'm thinking the sight might look awkwardly tall, but that's probably inevitable - it's either going to have a big tall ramp, a freakishly tall blade, or - a chunky square riser...
Skinner does make a 0.50" Patridge type sight that is 0.25" wide at the dovetail, but the user I'm helping out would do way better with a fiber-optic or gold-bead front sight.