I want to thank all the guys that gave me input into my questions. yes the secret is to SLUG your barrel be fore you do anything. I slugged mine and it came out at .510, DIA. so I loaded both kinds of brass that I have, smooth & with a grove at the base, with 2FG. BP. up to the inner shelf / ridge. and inserted into them the bullets that I shoot in my JOSLYN CARBIBE, .520, DIA. 10. ths. larger. thumb pressed them into the cases & gave them a light tap with a mallet, put them into the weapon and capped it and, BANG, instant ignition. it was a blast, pun intended! thanks to all who helped me. toot.