Am sure people in the past discovered this as well, but for me it was by suggestion of a friend watching me stuggle to load a paper cartridge in a cap-and-ball revolver. His suggestion was, "Why not make them tapered?..you look like you're fighting to put a square peg in a round hole."
So put the wooden down form in a drill and tapered the rear section down to .40".
The local tobacco shop owner must think I'm a big dope smoker...that could be a problem in a small town...but the rolling papers (esp. the double wide versions, but can put two normal ones togeter to get your width) are nitrated, thin, easily torn, and pre-glued. Once made and dry, will dip the ball in thick lube, but can build them with a wad under the ball if you've the urge.
Will just poke the end with a sharp point (some front sights work just fine for this), trickle in a few grains, and ram it on home.