I've got a Lyman Greatplains 54cal percussion rifle that I assembled from a kit years ago, my hunting load is 90gr 3F and when just shooting targets I usually just use 50gr. The front sight is to tall and has been since I put it together. At 100yrds, to hit the bull I have to have the front sight blade even with the top of the buckhorns on the rear so needs to be filed down. Shooting from 100yrds to try and get this dialed in is a pain, is there a closer distance I could move to to get me close then move back to 100 to finish dialing it in.  Thanks, hope someone can help me out.

Hmmm. Is there elevation adjustment in the rear sight? Is it wise to effect sight alterations for a load 1/2 as powerful as the hunting load? What will you do when hunting season rolls around and the heavy load prints way high because the front sight has been lowered? Not trying to be a smartypants, just scribbling some random thoughts.

Faced with much the same dilemma back in another lifetime, I made an aperture rear sight for on an Ithaca Hawken to simply&elegantly solve it. Might be a proper name for it, but it was simply a piece of flat spring stock screwed to the top barrel flat extending back over the wrist with a fine-thread screw that beared on the tang for crude elevation adjustment (kind of a miniature screwjack), aperture perched on the eyeball end of it.

On the other hand, maybe I missed the point of your question in which case never mind.

I'm not sighting it in at half the load, using my hunting load, so I've been told 13yrds and 25yrds, Think I'll do the 25 to get close then move back to 100. My lyman has fixed sites not adjustable other than right and left. Thanks