Re: Hello newbies from Lincoln
Posted: Mon May 21, 2012 8:12 am
Cartridge and bullet sizes are either in Metric or Imperial designations for the most. So if something starts with a number such as 7.62 it is a metric size, if it starts with a dot such as .308 it is an imperial size. Metric will include the case length where as imperial will not so a 7.62x51 has a nominal case length of 51,0mm's. Some are very similar despite different names. The 7.62x51 is nearly the same as the .308 dimensionally.
It is a subject that is worthy of a book and many have been published on the subject.
Look out for letters after numbers:
7.62x54R - the R stands for Rimmed
8x58RD - the R stands for Rimmed and the D for Danish
Now to confuse things some will have a second number and not be for case length. The 30-04 is a 30 calibre bullet in a case designed in 1903 and the 30-06 was designed in 1906. Also some have three sets of numbers, so a 6.5x47 is a 6.6mm bullet in a case that is 47,0mm long and a 22-6.5x47 is a .224" bullet in a case 47,0mm long designed for a 6.5 bullet.
:cheers:
It is a subject that is worthy of a book and many have been published on the subject.
Look out for letters after numbers:
7.62x54R - the R stands for Rimmed
8x58RD - the R stands for Rimmed and the D for Danish
Now to confuse things some will have a second number and not be for case length. The 30-04 is a 30 calibre bullet in a case designed in 1903 and the 30-06 was designed in 1906. Also some have three sets of numbers, so a 6.5x47 is a 6.6mm bullet in a case that is 47,0mm long and a 22-6.5x47 is a .224" bullet in a case 47,0mm long designed for a 6.5 bullet.
:cheers:
she's still waving. . . . .