Zeroing the 20X Malcolm on an 1885 High Wall

Standing at almost 26" long and 32oz in weight, the 20X scope is a heavyweight among classic scope designs. Today it'll be sitting on the 1885 High Wall, in .45-70.

The scope uses externally-adjusting mounts. In other words - when you spin a turret, you can see the plunger pushing the scope tube. And, when the rifle fires, you can see the scope slide.

00:20 Boresighting
Step 1 on any new setup is getting zeroed. We like to start with boresighting when possible, and the 1885's design makes it very possible. Drop the lever/block, look down the barrel, line up the scope. Easy peasy.

Parallax is set at the front, much like the 8X Malcolm. You'll be moving a ring in order to move the block of objective lens elements. In all other ways, the 20X differs from the 8X. There's no need to remove a sunshade or push in the end element. Instead, the parallax ring is pushed and chased by two lock rings. Oftentimes, you can even adjust the parallax without getting up from the rifle.

03:05 Zeroing
Time to get the rifle on paper and dial the scope in.

First shot was about 1.5" low and 0.5" right. Externally adjusting scopes such as this follow a very simple rule for adjustments: Move the eyepiece in the direction you want the impact to go.

To make the impact go up, I move the eyepiece up (counter clockwise on the elevation turret). To make it to left, I move the eyepiece left (clockwise on the windage turret). Since these rings are mounted 7.25" apart, the adjustments are 1/4 MOA per click.

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