yes, 14mm should be ideal for a .54.
I wanted to point out that 28 gauge is not .54, it is actually .55, and wads for it are .56. 28g in a .54 would be more highly compressed than in a actual 28g. Of course, that isn't saying they won't work...
Using the charts from circle fly and TOTW, and interpolating, wads for .54 should be .549 (14mm is .551, so closest)
My big problem is I don't know exactly what material to use. There seem to be as many opinions on that as there are people with opinions.
The basic gist I have gotten is,
1/8 over powder
1/2 cushion
1/16 over shot
Because I want a consistent source, not scrounging through the recycling bins for milk cartons, I'd like to use all felt for these, but I'm not sure what densities to get. Durofelt carries multiple weights..
.20, .26, .36, .50, .70, .80, and probably more.
I use .36 x 1/4 for revolvers.
So I know the over powder should be 'harder' than the cushion.. how 'hard' should the over shot be, compared to the other two?
I've been thinking of .50 for over powder, .36 for cushion.. or should I go .36 over powder and .26 cushion.. .50 is used in final edge sharpening for knives, so maybe too hard?
any thoughts?