again the 25-20SS rears its pretty head !  i have seen posts on making 25-20 SS from .223 and i have a question. if the body will form the case does it need a rim? with my CPA i can get extraction using a piece of bent metal where the extractor cut is. the metal slips behind the extractor groove and seems to work fine. the 223 brass is hecka stronger also.   comments???
thanks     dave

Dave,
It can be done but, it's so much easier just to buy Jamison brass.

The spec's I get from my 25/20 ss brass are, Rem 25/20, .375 rim, .050 rim thickness, .313 csae head.

G&H 22/3000. .375 rim, .049 rim thickness, case head .315

Jamison 25/20, .375 rim, .047 rim thickness, case head .315

Several 223's, both military and commerial run, rim thinkness .040 - .045, extractor groove .327 - .330.

It would be a lot of work and if you used the thickest 223 rims that you could find, you would have about .005 extra head space.

The rim of the 223 is .375 and you would just need to swage the 223's, down to the solid head to 5/16 and then turn the head to .315.

Run them through a 25/20ss die, trim and fire form.

I've made 32/35 Stevens out of 30/30 this way and also 32/40 out of 30/40 brass.

Not to hard but, you have to have a lathe and a swaging die. You can not swage the solid head down that much w/o a hugh amount of pressure and effecting the primer pock size.

$2 a case is a small amount to pay considering what it takes to do the above.

Frank

When nothing else was available...it worked. As posted above the cases came up about 5 or 6 thousandths short on headspace but they were useable and heck for strong. Now that the Jamison brass is available it just doesn't make sense if you value your time at more than  ten cents an hour.

223  to 25-20     We used to do this a lot, just turn the web down to size, and press into a die.  Sectioning a case will show you how/where to turn the web.  Then FL in 25-20 die and turn the neck.   Makes a good, heavy case.   Not all THAT much work.  I am still shooting some from 30 years ago.

CHRIS
RGChristensen

    

The rims can be bumped forward from where they meet the head. you will need to make a die to give the rim a slight angle forward and a pin to fit inside the case to push against. I hope that is a clear enough explanation, it's way short of the standard 1K words= 1 picture.
kootne
ps, I bought a bunch of 25/20SS BR&C cartridge brass years ago at an estate sale and  gave away my homemade from .223 stuff. I agree with the guy who said it's easier to buy than make. But I suppose that varies depending on if you're working (making $) or retired (trying to squeeze the $ as far as it will go).