PP 9.3x57

[dragonrider]

So I have a 9.3x57 with a large bore, .372". Also a chamber cast reveals that there is no throat. Or more correctly it has a thoat that is exactly bore dia. .372" from the end of the chamber to the start of the rifling. the rifling starts at .550" from the end of the chamber. I have pp'd some NOE 359008 ?? a GC'd round nose at 280 grains. I patched it to . 374" and sized to .373". When I attempted to chamber a dummy round that I have loaded so that the gas check was still in the neck the exposed paper was crushed back to the case mouth, If I push the boolit deeper so that the top land is even with the top of the casemouth then the gas check is about .250" below the neck. I fear that when I fire one it will shred the paper off at the end of the chamber and send a .358" boolit down a .372" barrel to who knows where. I am thinking a throating reamer may be of some help here or perrhaps rechambering to 9.3x62 but I think I was to go to a throating reamer first and creat a tapered throat from chamber end to rifling beginning with dimension of .385" to .372" for a distance of .562" this should allow the paper patched boolit to enter the rifling without loosing the patch. A couple of pics below. I shaded the end of the chamber and the begining of the rifling. http://img.photobucket.com/albums/0603/PaulGauthier/IMG_9923.jpg

Also made a new expander button for the die that sizes the neck to .372".
http://img.photobucket.com/albums/0603/PaulGauthier/IMG_9918.jpg

So far everthing works well but don't think that throat is going to allow patch to fit down into the barrel.
Any thoughs??????

[45 2.1]

So I have a 9.3x57 with a large bore, .372". Also a chamber cast reveals that there is no throat. Or more correctly it has a thoat that is exactly bore dia. .372" from the end of the chamber to the start of the rifling. the rifling starts at .550" from the end of the chamber. I have pp'd some NOE 359008 ?? a GC'd round nose at 280 grains. I patched it to . 374" and sized to .373". Patch to 0.3715" or so and fill the throats length seating the patched boolit into the beginning of the lands slightly. Don't alter the throat. When I attempted to chamber a dummy round that I have loaded so that the gas check was still in the neck the exposed paper was crushed back to the case mouth, If I push the boolit deeper so that the top land is even with the top of the casemouth then the gas check is about .250" below the neck.

[dragonrider]

Ok I will give that a try, will mean making a new sizer but that is no problem.

[303Guy]

May I ask you to post a picture of that gun? Thanks.

[dragonrider]

303 guy I will do so as soon as I can. We are getting dumped on by mother nature for the next two days so I will be very busy moving snow, or white s&#&* as I like to call it. :(