FINALLY figured out how to copy this and get it to here. Whew! That was a workout. Anyway, here is the tech drawing for AMPACT cartridges. There was a thread some time ago about a similar cartridge, and could be the same thing, but I couldn’t find it to post from. So, ignoring the potential for a duplicate thread, here’s an interesting “thing”. I have the blue and yellow ones. The yellow for installing, blue for removing. Uses a device similar to the Remington “cold chisel” nail gun, requiring a light tap to initiate. The primer appears to be a No. 209(stamped M 12o’clock/F 6o’clock. The drawing depicts a different type primer. Mine have the 209s. The firing pin is a bump on a rod, akin to an UZI or M1A1 bolt, that slips into the shell. The primer is inside, facing down, if you will, and ignites the charge in the base. All plastic construction. This drawing serves as a better reference than any pictures or scans. I tried. I suck at that. So, here’s this instead.
Base dia.: 0.84"/21.3mm
Mouth dia.: 0.63/16
And for the first three respondents, the prize is a matched pair of these. I plan to keep 2 for meself and will pull a Paul on one. If I screw that up, I’ll have to cut into the second “spare”. Let’s see who’s watching today.