Fripo,
I'm sure the case Sharps 4590 sent you is a 9.3x72R Norm.( Norm.=Normalizert[?]=normalized=Standardized), as he uses them in some of his rifles. This is a case intended as a compromise in dimensions between the old 9.3x72R D , 9.3x72R E, and English 360, in an attempt to derive a case( cartridge) that would fit the most old chambers possible. I don't think I refered to an 8x72R Norm., but did say The 8x72R was based on the 9.3x72R Norm. case (this may not be precise depending on when it was normalized, but that is the case you should use). There is a temptation to size a 9.3x72R case to 8mm and use it as is. This is a mistake, the case will lengthen in sizing and must be trimmed. I sized a case in a 32-40 file trim die and fireformed ( untrimmed). The chamber then showed where the case should be trimmed to( there was an obvious constriction at the end of the "chamber"). I trimmed the case to a length that fit the chamber, and in my case this was about 2.840"+. Your chamber cast showed a shorter length, but if you find a useable case length, in a manner similar to that I used, and use bullets that fit the chamber/barrel; it makes no practical difference what name you call it by. After all, you can't go to the Mall-Mart and buy ammo anyway. BTW, COTW has several mistakes that are not always clear until you compare their dimensions with actual rifles, and the confusion surrounding the S&S name is another mistake, brought about by the case's shape. Also, there are a great many nominal calibers not included in COTW. Are you having fun yet?
Mike
I'm sure the case Sharps 4590 sent you is a 9.3x72R Norm.( Norm.=Normalizert[?]=normalized=Standardized), as he uses them in some of his rifles. This is a case intended as a compromise in dimensions between the old 9.3x72R D , 9.3x72R E, and English 360, in an attempt to derive a case( cartridge) that would fit the most old chambers possible. I don't think I refered to an 8x72R Norm., but did say The 8x72R was based on the 9.3x72R Norm. case (this may not be precise depending on when it was normalized, but that is the case you should use). There is a temptation to size a 9.3x72R case to 8mm and use it as is. This is a mistake, the case will lengthen in sizing and must be trimmed. I sized a case in a 32-40 file trim die and fireformed ( untrimmed). The chamber then showed where the case should be trimmed to( there was an obvious constriction at the end of the "chamber"). I trimmed the case to a length that fit the chamber, and in my case this was about 2.840"+. Your chamber cast showed a shorter length, but if you find a useable case length, in a manner similar to that I used, and use bullets that fit the chamber/barrel; it makes no practical difference what name you call it by. After all, you can't go to the Mall-Mart and buy ammo anyway. BTW, COTW has several mistakes that are not always clear until you compare their dimensions with actual rifles, and the confusion surrounding the S&S name is another mistake, brought about by the case's shape. Also, there are a great many nominal calibers not included in COTW. Are you having fun yet?
Mike
Comment