Sometimes it's not to put the ball closer to the chamber mouth.
If yer loading on the gun & using light charges, your loading plunger may not be long enuf to seat the ball on the powder.
A bit of cornmeal overcomes this problem.
I load off the gun on a Powder Inc cylinder loader, so this is not a problem for me.
However, a bunch of cornmeal over the powder compresses it a bit and helps avoid chain fires from the front of the cylinder.
One way to avoid screwing up--load powder in 5 chambers, then load corn meal in 5 chambers, then load balls.
easy-peasy
--Dawg