I have learned to use some sort of indicator at each step of the loading process. I have either a funnel or fitted measure that fits in the bore when I pour powder. That is left in the barrel until I have the ball and patch material at hand and ready to load. Then the funnel or measure is removed and the next step begins. I think I may need to make a large washer for the range rod that will obscure the sights. I have a large leather hammer stall for my flintlock to cover the frizzen and part of the tab will block the sights. Admittedly it is not as catastrophic to have your flint try to draw sparks from leather, but I have been responsible for enough entertainment on the shooting line.