ty...wow, i don't know why that didn't click in my head.

as far as my stupidity...i was tired when i did that math and i accidently used the diameter instead of the radius.

I understand how to get the volume of both the barrel and chamber, however I'm lost from there. for instance if i have a 2'' barrel that is 60 inches long the volume is 753.6. if i have a 4'' chamber that is 24 inches long i have a volume of 1205.76. but how do i get the ratio from that point?