I hadn't thought of leaving the necks on and plugging the small end. Good one. An '06 case will hold 60 to 70gr. depending on where it's cut and if expanded out a bit at the shoulder.
Short mags will hold 75 to 80gr.
Range pickup Ultra Mags will hold 100 or more.
.270 and .30 WSM type will run 60 to 65.
I use CA for gluing in the wooden plugs, along with the string or thong.
I've been turning off the base end, rounding it and using a screw-eye soldered into the flash hole for some, .015" wall fit together brass tubing from a hobby store for larger measrues to 140gr.
James - I also hadn't thought of merely pinching off the case mouth and cutting off the head- good idea- might have to build some like that for Hefley Creek - I figure $1.00 to $2.00 is cheap enough - besides, having to weigh in powder charges to label as to thrown weight ought to be worth something for 'labour'.