Since we were worried about confusion with the Mk262, we had to take another look at the color of the tip. The Mk262 is an open tipped match round used by the Special Ops community. If you donвЂ™t know ammunition well enough you might confuse it with the Mk262 which is a 77 grain projectile. This is a copper jacketed, open tip match, 62 grain projectile. The original round was adopted as Mk318 Mod 0. 0 round with a higher ballistic coefficient, is competing against the M855A1 round developed by the US Army, according to Fanelli: 1, an improved, lead-free variation of the Mod. Even so, as he says the requirement вЂњremains in the discussion phaseвЂќ. This is one of the few government sources referencing a requirement for an intermediate round between 5.56mm and 7.62mm that I have seen. Of course, with the same technology approach, we know today that we can get a better performing 6.8mm round and 7.62mm round than the NATO standard 7.62x51mm M80 Ball. In a similar way, our improvements have now given us a 5.56mm round that gives us the performance of the current 6.8mm round.

Remember the Belgian SS-109 ammunition? It was selected as the NATO standard in the U.S., and was designated the M855? Well, that ammunition outperformed the Vietnam era M193. Instead, our development resulted in a round that equaled the performance of the current 6.8mm round. The intermediate caliber requirement remains in the discussion phase. If we could improve the consistency of the terminal effects of our current 5.56mm round and use it as a temporary solution, it would bridge the gap until we could get the requirement going for an intermediate caliber. There was a pending requirement for a new intermediate caliber. Interestingly, while Fanelli does not give a reason for the inconsistent performance, Major Glenn Dean, US Army, did present one in his paper Small Caliber Lethality co-written with David LaFontaine.ДЇanelli also commented on the possibility of the USMC seeking a round intermediate between 5.56mm and 7.62mm: We needed this performance at ranges from 0 to 400m. We needed a round that gave consistent terminal effects from round to round, ammo lot to ammo lot and gave the exact terminal effects every time. We considered this inconsistent performance and confirmed that the M855 was impact yaw dependent. Other rounds went straight into the block and straight out of the block вЂ“ no yaw, no enhanced terminal effects. It provided adequate terminal effects, but this didnвЂ™t happen every time. What we mean by that is from high speed videos of one round from an M4 we observed the path of the projectile doing exactly what we expected. Firing into a block of ballistic gelatin, we determined the M855 had yaw dependency. USMC determined that the performance of the M855 was inconsistent. Why did the USMC decide they needed a new round of 5.56mm ammunition? 1 вЂњSilver BulletвЂќ, and even the potential for a new caliber for USMC rifles: SADJ has posted an excellent interview with Donald Roebling Award winner Sal Fanelli, a supervising engineer for Infantry Weapons Systems at MCSC.

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