Neondog, thanks for the suggestion. I will definately be trying that when I get a little time. I did find that reducing the width of the paper helped in getting the longer cone. I was using a half of a magazine page (approx 4")...I reduced it to 1/3 of a sheet (approx 2 1/2") after watching LGDs video. In doing that, I can make a cone that is small enough that it won't work in my .50 cal BG. I also started using small finish nails in the tip for weight and for tip strength and that also helped.
I have a friend that will make me some wooden forming tools if I can get him some measurements. If I can get something made that will work well, I can have him make me a bunch of each of the sized that are commonly used....40 cal...50 cal.....625 cal. So if anyone has any of the measurements, we can get these available.