They certainly look very similar
http://www.oldammo.com/june06.htm
Perhaps Peters used the oddball paper cartridge machinery on both. Even though it wasn't what I thought, it still brought a smile to my face envisioning a rioting crowd "steppin n fetchin" after a couple of Thompsons dumped a mag of birdshot.
The blank headstamp gives me the creeps. Somewhere around here I have some 8mm and 7.62x51 with no headstamp. Ain't gonna shoot it, not even in a 98 Mauser. 
Complete thread:
- .45 ACP odd balls...What are they? -
Rob Leahy,
2013-08-15, 10:59
![[*]](themes/default/images/complete_thread.png "Open whole thread")
- The one on the left; - cas, 2013-08-15, 11:15
- Peters "riot cartridge" on the left. -
John K.,
2013-08-15, 11:25
- Looks like a shot cartridge but it is not... - Rob Leahy, 2013-08-15, 11:27
- the one on the left.... -
Glen,
2013-08-15, 11:38
- Not even close... -
Rob Leahy,
2013-08-15, 11:41
- Like I said.... - Glen, 2013-08-15, 15:00
- Not even close... -
Rob Leahy,
2013-08-15, 11:41
- Looks like a rubber bullet to me. Don't think I've -
Hobie,
2013-08-15, 11:46
- paper capsule full of yellow wax like dye used for brake -
Rob Leahy,
2013-08-15, 12:06
- They certainly look very similar -
John K.,
2013-08-15, 13:14
- Yep, me too suposed to be a HOT Sub MG round. -
Rob Leahy,
2013-08-15, 13:17
- The Ingram M-10 would digest it with no problem. -
John K.,
2013-08-15, 13:27
- The Ingram M-10 Probably the one. - Rob Leahy, 2013-08-15, 13:44
- The Ingram M-10 would digest it with no problem. -
John K.,
2013-08-15, 13:27
- Yep, me too suposed to be a HOT Sub MG round. -
Rob Leahy,
2013-08-15, 13:17
- That'll teach me to be busy doing things instead of on the - Paul, 2013-08-15, 18:24
- They certainly look very similar -
John K.,
2013-08-15, 13:14
- paper capsule full of yellow wax like dye used for brake -
Rob Leahy,
2013-08-15, 12:06