Well, after the Zimmer thread, I couldn't stand it any more. So, I worked a few days figuring out my own version.

It's all shown in the picture. 

1. 8.15x46R case.
I bored it out for shot gun primers. I didn't use standard primers because I didn't want to use re/de cap tools. The other reason is so I can just push the shot gun primer out with a pencil and recap. The primer is drilled and reamed #C (.242). A few thousands of the primer is out side the case to capture it and seal it against the case with the breech block. The case is chamfered at standard 82 deg.

2. The ball.
I have a coffee can full of buck shot (.330 dia). My groove is .316. So, I thought it would be a good diameter and would fit the throat  well. It pushes into the case and will stay there while I put it into the lube (Darr) much like you lube the Zimmer balls.

3. The load.
I was hoping to just have to use the primer but, the ball wouldn't exit the barrel. So, I have some old bulk smokeless and tried .3cc (Lee dipper) of that, it was very dirty and to fast Next, I took a dip of B'eye (2.5 gr) Burnt clean but way to fast I drilled out the dipper and threaded it 1/4x28, screwed in a 1/4" long set screw, even with the bottom. It gave 1.7 gr B'eye, still a loud crack Threaded it deeper and adjusted it to dip 1.0 gr B'eye (as pictured), went out and tried it, no crack and fairly clean   I can hit my little swinging targets at about 40 ft.

I'd be happy to answer any questions.

Frank

Thanks Frank real cool creative idea.
  I have a little 8.15x46 stalking rifle that is just a too light for real ASSRA shooting.  it might make a real good basement gun though, using your system.

Just have to figure out how to drill the cases out with my limited tool selection.

I'd suspect a new unaltered case with a small pistol primer has got to be ideal. You can use a small hand punch to pop it out.

I Chronographed it today.

5 shot average, 54 gr ball
F209A
1.0 gr B'eye
692 fps, SD 24, ES 40

1 shot
F150 pistol primers
1.0 gr = 571
1.6 gr = 772
2.0 gr = 1109 sonic crack

Not real good numbers but, OH I could hit a 3.5" disk at 40 ft each shot. And it doesn't hurt the steel swinger.

Frank

I did a ten shot group with my Zimmerstutzen today at 5 pm in the shade with my post front sight, using a 6 o'clock hold. My aperture is very small and the sight picture was fuzzy. The group was fired at a measured 50 ft.

I lube the ball after it's in the case by pushing it into my pan of Darr Lube and I might not of even needed that since factory 00 buck comes graphited.

I didn't use my dipper this time, I set my Redding pistol measure for 1 gr. I didn't chrono the shots but, I found that the first two shots (on a sighter) were 3 inches off, I fired 3 foulers before I started.

In my opinion, it didn't group any better than it chronographed. Has anyone grouped there Zimmers? If not, could I get someone to do a group at 50 ft? I'd like to compare.

Frank

Dave,
I'd use the same ball as I did. .330 diameter 00 buck shot. It might work better than me squeezing them down to .316. I'd start with a pistol or rifle primer and 1.5 gr B'eye and work up untill you hear it crack. You won't have any trouble know when it does, it's VERY loud, then back off.

I don't think a bullet trap will have any trouble catching them. They weight 54 gr and are going slower than 40 gr 22 rf. They flaten out completely against my 1/4" thick swinger target.

Frank

Frank, 

I don't have any Bullseye but I have W231 and Alliant MP300.   I will try the MP300, it is what I load in my 32-40.  Any thoughts?   

David

Dave,
Your in the perfect possion to tell us how they work. I would use the same amount of 231 as B'eye and work up. I found it to be dirty with my BSed 22 rf or I would have used it first. As far as 300MP, it may be to slow and dirty because it might not all burn but, the only way to find out is to try both. I'd start with 3 gr 300MP. My next powder will be AAC #2, I think it might be cleaner but, I have no way of knowing w/o trying it. 

The more people try it, the more we will find out. This is brand new stuff to me, too and there are a lot of combinations to try.

Frank