06-28-2011, 07:07 AM
stanc Wrote:Okay, Gary Roberts posted the following on arfcom:
"As presented at a joint USG meeting this past March, the bullet diameters tested were described as: .224", .243", .257", .277", .308""
Converted from inch to metric measurement, those figures correspond to projectile diameters (not calibers!) of 5.7, 6.2, 6.5, 7.0 and 7.8mm, the sizes Tony said were tested.
Which means that it was .264" which was omitted from the test. The Army did about the same thing once before. When developing variations using the 7.62x51 case to create the "homologous" rounds, there was a .25-caliber version and a .27-caliber version, but no .26-caliber.
Yes, that is correct - my initial assumption that the usual military convention of quoting bore diameters applied was wrong. Neither the classic 6.5mm (.264 bullet diam) nor the 7mm (.284 bullet) were tested.