Don,
When it comes to paper for PP I might be to particular what I use. I try to stick with a 75 to 100% cockle finish cotton paper with as little sizing in it as I can find that keeps the ink from bleeding through and it is softer then 25% or just straight wood pulp paper like the Paper mill has. The 100 or 75% cotton is soft enough that it will compress a little so I can seat the round with ease. A hard paper like tracing paper that is a vellum like the 55-Y I want to fit the bore snug even as soft as the 55 Y is. When the bullet is to tight and when the round is seated it puts more tension on the bullet changing the release and compressing a loose powder load more or less if the fouling is not all removed from the throat or even a clean throat and it increases the vertical.
My moulds are cut for using .0018" thick paper so they patch right at bore to one halve to not more then one thousand over bore diameter depending on the paper so I can seat the bullet with ease and the bullet makes uniform contact in the bore with no chance of misalignment that can happen from a loose fitting or a very tight deep seated bullet that can get a lot of misalignment in the bore with a loose or even tight chamber. It's just my way right or wrong but I'm sticking to it
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