There is not much surface to play with as these shells are thin.
1/8" to 3/16" of bearing edge.
I used to do a 45 on both sides.
Sharp point on edge. Loud sound. It was Fine.
Now i do what Jerry did.
Just a round over. A little smoother sound. Mellower just a touch.
Very subtle change.
I do the edges by hand with a sanding block.
I make a guide/true mark on top of the bearing edge,
and keep it there, sanding up to it and around it.
This line shows me the center of the edge and the flat/true part of the edge.
The guide line is still there when the heads go on.
That line is about 1/64 of an inch at that point.
AND, it looks cool. Green line for green drums.
Red line for Red striped drums.