05-17-2011, 04:05 AM
LRRPF52 Wrote:One thing I want to point out, which many of you already know from looking at your bullet boxes, is that 6.5mm projectiles that are .264" are really 6.71mm, not like the real 6.5mm or .257". To see the difference between a 7mm, 6.8mm, and 6.71mm requires me to use calipers.Umm...you're just going to confuse matters by calling 6.5mm bullets, 6.71mm. But, if you really want to go down that road, I'll point out that 7mm bullets are actually 7.21mm, and 6.8mm projectiles are 7.04mm.
:p 
Caliber, in the US military, anyway, is generally set by the distance between lands in the rifling, not by bullet diameter. There have been some exceptions in the past -- such as the 1930s .276 Pedersen, which used .284" bullets -- but current practice is as noted above.
Please, stick with 6.5mm, like everybody else...
