Mine shoots low as well. I’m wanting to create a new bullet mold for both of my revolvers and I have a new powder measure that after I modified it will allow me to more accurately work in 2.5 grn increments so I want to go back and ensure I’ve found the most accurate powder charges before I make permanent changes. I’m also not sure if I’d be happier if it were cut back to 4.5” or so. I’ve always felt 4” was about ideal for a revolving sidearm.