My old adjustable measure goes from 50 to 120 grains. It's one of these:
Two charges from my 25 grain spout doesn't quite fill it all the way at the 50 grain setting (I'm certainly losing a bit of capacity from cupping my finger over the spout. I used to have one that went by 10 grain increments, but I'm only just getting back to shooting again and I have no idea what happened to it. So unless the adjustable measure is really inaccurate, the spouts are about right.
Also, the only thing that trying to tap the ball in any further does is flatten the nose.
Finally, since I'm jammed anyway I tested a a ball without any powder at all as far as it would go, and it loads with about 1/4" between the tip of the bullet and the front end of the chamber.
I noticed that the chamber interiors are rebated (you can see the small "step" in the picture of the interior). Is that standard?