My copy of the June 2005 American Rifleman arrived today. I scanned it briefly, and found on p.51 a puzzling statement in a sidebar titled "6.8x43 mm SPC: Fatter is More Chic". The sidebar describes the development of the cartridge and its introduction by Remington to the civilian market.
The puzzling statement starts the third paragraph: "The .30 Remington case, which is slightly thicker than the 5.56 case, but is exactly cylindrical, serves as the basis for the new cartridge." (Emphasis added.)
I assume that "thicker" refers to diameter. What I can't comprehend is the description of the .30 Remington as being "exactly cylindrical". The context provides me with no clues.
According to a SAAMI drawing I have, the .30 Rem tapers from about .422 inches at the head to about .402 at the shoulder. That would seem to make it conical, rather than cylindrical.
Cartridges that SAAMI specifies as being cylindrical include the .25 ACP, .32 S&W, .357 Mag, .38 Short Colt, .38 Special, .38 ACP & .38 Super, .45 Colt, and a few other cartridges designed for pistols and revolvers.
I'm hoping somebody can tell me either of the following:
(A) what feature of the .30 Remington case makes it (and not the 5.56 case) "exactly cylindrical"; or
(B) What did the author mean to say? That the Remington case was rimless?
Thanks for any helpful translation.
--Bob
(UBB markup deleted from title on 5/14)
The puzzling statement starts the third paragraph: "The .30 Remington case, which is slightly thicker than the 5.56 case, but is exactly cylindrical, serves as the basis for the new cartridge." (Emphasis added.)
I assume that "thicker" refers to diameter. What I can't comprehend is the description of the .30 Remington as being "exactly cylindrical". The context provides me with no clues.
According to a SAAMI drawing I have, the .30 Rem tapers from about .422 inches at the head to about .402 at the shoulder. That would seem to make it conical, rather than cylindrical.
Cartridges that SAAMI specifies as being cylindrical include the .25 ACP, .32 S&W, .357 Mag, .38 Short Colt, .38 Special, .38 ACP & .38 Super, .45 Colt, and a few other cartridges designed for pistols and revolvers.
I'm hoping somebody can tell me either of the following:
(A) what feature of the .30 Remington case makes it (and not the 5.56 case) "exactly cylindrical"; or
(B) What did the author mean to say? That the Remington case was rimless?
Thanks for any helpful translation.
--Bob
(UBB markup deleted from title on 5/14)