Peep sight

[topper58]

Hi.

I have a H&R Topper 58 in .30-30 that I want to buy a peep sight for, namely the Williams WGRS receiver sight that they put on the Classic Buffalo.  A "Lyman front target sight #17A" is supposed to go with this, but when I try to order this from Midway, there are four different sight with different heights to chose from:

"#17AHB" .404" height
"#17AML" .494" height
"#17AUG" .584" height
"#17ATC" .852" height

Does anyone know which one is right for my rifle with the WGRS?

Thanks in advance,
Jorgen (Norway)

[quickdtoo]

Welcome to GBO, Jorgen!! The Williams catalog download has instructions on how to determine sight height, here's the text that accompanies that part of the catalog, there's also a graphic that I can't copy.  The catalog download is 50Mb, so you may not want to download it depending on you connection speed. The Lyman sight heights are measured from the bottom of the dovetail base to the center of the globe. You may also choose to contact Williams for help.

Hope this helps,

Tim

http://www.williamsgunsight.com/contact_us.htm

http://www.williamsgunsight.com/gunsights/pdf/2007CatalogLoRes.pdf
 A=barrel diameter where front sight is to be installed.
 B=barrel diameter where sight is to be installed.
 
Step by step procedure for
selecting open sights for
tapered rifle barrels.
STEP ONE: Measure diameter of barrel at
Point “A” where front sight is to be installed.
(Example: .660 Dia.). Then divide this diameter
in half to determine height from center of
bore to top of barrel.
(Example: .660 ÷ 2 = .330).
STEP TWO: Measure diameter of barrel at
Point “B” where rear sight is to be installed.
(Example: .820 Dia.). Then divide this diameter
in half to determine height from center of
bore to top of barrel.
(Example: .820 ÷ 2 = .410).
STEP THREE: Select rear sight to be used
and add its height to the height determined
in Step Two. (In this case we have selected
the WGOS with 3/8” blade rear sight which
is .560 high at its center of elevation adjustment).
This gives you the total height of the
rear open sight from the center of the bore.
(Example: .410 + .560 = .970).
STEP FOUR: You now subtract the height
from the center of the bore to the top of the
barrel determined in Step One (.330) from
the total height of the rear sight determined
in Step Three. (Example: .970 - .330 = .640).
This tells you that you need a front sight
ramp and bead combination approximately
.640 high to accommodate the rear sight.
STEP FIVE: Using the Williams Sight
Combination Chart you select a ramp and
bead coming closest to your height needed
as determined in Step Four (.640) which in
this case would be the 7/16” ramp with
.290N bead giving a height of .6375 as
shown on the Chart.
By following these procedures, sight
combinations can quickly and easily be
determined. When selecting ramp and
bead combinations from the Chart, the
height need not be exact as there is ample
elevation adjustment in the WGOS open
sight to compensate for slight variances.
Point “C” in the above drawing shows the
proper line of sight parallel to the center
of the bore when the proper combination
is used. When ordering sights and you are
still in doubt as to the proper combination
please include the dimensions of your barrel
at points “A” and “B” so we may assist you
in the proper selection.

[topper58]

That really did help - I'll be able to figure it out.  Thanks a lot, Tim.

Jorgen

[quickdtoo]

You're very welcome, please feel free to ask more questions if you have any, lots of folks here to help. 

Tim