Well let me give my take & that's all the heck it is.I been shooting these guys awhile but
I,m no exspert on this.But I like the question & I can only give my 2 cents.We know each
gun is differant.My Lyman GPH likes .015 pillow ticking & a .530 ball.
She goes in very tight & I do use a short starter & always have.But Lyman GPH has a
deep rifleing.I was told when I first bought it that thick Pillow ticking worked best.
But maybe that has something to do with how tight they go in.Now on my .50 Flinter
the rifleing is not near as deep & I use .010 Pillow ticking & it not hard to seat at all.
Maybe that has something to do with it.But what do I know, I,m just guessing.
Fly