Drill stops and such are great for seating bullets to the same depth and with the same pressure each time. I use them. But you have to remember that they do not tell you if there's no powder in the bore.

When I marked ramrods I used masking tape. But I've kind of gotten away from doing that. Now, I just make a mental note of how many "fingers" of rod are sticking out of the barrel on a full load.