rgchristensen wrote on Jun 28
th, 2016 at 11:55pm:
Some years ago, I shot a rifle with one of its interchangeable bbls in 28 caliber. It was chambered for a straight 38 SPL case and used for breech-seating. Not, of course, necessary to have a neck on the case if you are breech-seating. This worked fine, and was pleasant to shoot, but not QUITE as accurate as a 30 Schwartz on the same rifle. If I were building another, I'd look at the 32-20 case, or the straightened version, 32-20 CPA. This same case might also be suitable for a 6.5 mm, 25 cal, or 6 mm bore. One one might start with a 32 S&W case, leaving the option of going to a 32-20 case if the former was not large enough.
The notion of a small, straight case for a breech-seating barrel does not seem to be utilized very much, but it makes sense to me. They are very easy to load, easy to make a durable breech-seater for, and the brass is cheap. It is possible to just bore the chamber, using a 45 deg. taper to the bore at the end of the chamber, thus obviating the need for a special chambering reamer.
CHRIS
RGChristensen
Thanks Chris - it took me a while to understand your proposal - ie. to have, potentially, a jump from the interior diameter of a straight-walled case to the bore diameter. Did you find any issues with fouling, corrosion, etc.?
Has anyone else tried this approach, for a purely breech seated set-up?