I have a .54 Kibler Colonial. I love the gun but I’ve shot about 50 .490 prb thru it with red/wht pillow ticking patches and 80 grns ffg and can rarely find the patch. When I do it’s shredded. I ran a few scotchbrite pads thru the bore hoping to knock off sharp rifling edges. I haven't been able to shoot it since then so not sure if that helped. I use Mr Flintlock lube.
I've tried the red/white pillow ticking and it doesn't hold up. I've heard that some ticking is a looser weave than it used to be. I've gone to muslin and get better results with less patch blow up