'74 Sharps rep elevation change

[Martini2]

This '74 rifle is set up for irons only sights Parker aperture front and Lee Shaver Soule rear. Seem to recall some of Kurt's infinite wisdom on a particular rifle that was subject to hand grip pressure or shooting position. Possible barrel vibration node on cross sticks too? Since this rifle was christened with the wacky feminine name of " Lucy" she just may be having her way with me Thanks for ideas and comments.