I messed around with them some, about 20 years ago. They
are messy. I shot them in my S&W 586. Here's what I did:
1) I took some old .38 special cases, deprimed them, and drilled out the flash holes to a larger diameter. This prevents the primers from backing out and tying up the cylinder.
2) IMPORTANT! I used a narrow slitting file to make a big, deep X right across the head of each drilled out case. You must ensure these modified cases are never used for "real" loads.
3) Optional: I used my chamfering tool to sharpen the case mouths. This makes it easier to cut out the bullets.
Here's how you use them:
4) At the grocery store, I got a box of Gulf Wax Parafin:
http://www.idealtruevalue.com/servlet/the-50487/Detail
It's used for canning. You get slabs of parafin wax about 3/4" thick. (You can melt the leftover scraps and pour new slabs of wax in a shallow pan. Melt in a double boiler, i.e., a tin can sitting in a pan of water, NOT over a flame. )
5) To load the rounds, just press the unprimed case into the block of wax. It will cut a plug of wax which will fill the case mouth. That wax plug is the bullet, like a full wadcutter. It will be flush with the case mouth. You have to let the air escape out the flash hole. (If you prime the cases first, the compressed air will push the wax right back out.)
6) Now you seat the primers, using your favorite method, and that's it.
I just put some newspaper in a cardboard box, tacked a target on the front, and blazed away indoors at about 4 yards.
Impressions:
> The room will quickly fill with smoke.
> The room will smell like someone blew out a bunch of candles.
> Primers are pretty loud. Wear your earplugs.
> After a dozen rounds, take a look at the bore of your revolver. What a mess! Huge chunky gobs of black crud.
But it's only burnt wax, and cleans up with no harm to the gun. Make sure you clean it out before you fire any real loads though, as I'm sure it would jack up the pressure, possibly to dangerous levels.
> It's great fun, and you should try it.
>
I was a bachelor when I did this.