Gear has basically covered the paper ring. That is exactly what I was referring to. What I have concluded is that if the patched boolit has nose resistance entering the bore, the boolit base will tend to bump up. I have experimented with reducing the nose section diameter and also shortening the boolit so as to allow the boolit to start moving before encountering the resistance. This nose resistance is I think, also responsible for boolit canting in the bore.
My little carbine with its really worn and eroded bore, especially the throat area, shot well with a softer alloy with a two-diameter sizing of the boolit core. Unfortunately, I don't remember exactly what I was doing at the time and my notes are unclear. It won't be too difficult to figure it out since I still have some of the same boolits left, including patched ones and photos so I can see what paper I was using. It may take me a little time to figure all this out due to circumstances. I do remember that the boolit in question was a 208gr round nose with a small hollow point. I have a photo of a fired one using a light charge. The curious thing is that the patch stayed on right into the catch medium.
https://i.postimg.cc/kGfqNGnP/DSCF8749.jpg
Then the bore rusted and that didn't happen anymore. But now after some polishing and firing, it is smooth again.
I'm compelled to post a picture of it. :mrgreen: It's a great little rifle! Fun to shoot.
https://i.postimg.cc/XqZdkvLy/32.5gr...XIX_PP_003.jpg
Anyway, Initially, I developed a load for it by stepping up the powder charge until the patch was fully coming off at the muzzle. But only just.
https://i.postimg.cc/LsDdqwrM/MVC-605F.jpg
After a while, the accuracy dropped off and I found that the bore had polished up and was no longer cutting the patch through, so I had to increase the powder charge.