i use quickload but i must admit that i have never used the black powder portion of it there is an option to import data from quick design ( Quickdesign info
) directly into ql. You might need both programs, one to design your caseless 'case' and then import that into ql from there i would think that you could play with length until you reached your objective.
however, best to call ed dillon at neconos direct he's a great person and always very helpfull
might be a hoot to play with