The 5.56mm SS109 round weighs about 62 grains. The 6.8 weighs areound 115-120 grains. It is a much heavier round with better penetration.
However, the AUSteyr would need to be re-engineered to accomodate this larger caliber and your ammo factories would have to switch over to making the new round.
As always, it is difficult to change calibers when one has already been established. It has certainly be done, but there is a lot of hesitation by the government/military.
The 6.8mm round is not in major production in the US, and all factories that make and sell mil ammo in the US are cranking out as much 5.56mm as possible for the ongoing wars.
The easiest thing to do with the 5.56mm is to go to the heavier 77 grain MK262 round, which has proven to put people down much down more effectively in Iraq and Afghanistan.
The only thing is that to use it at longer distances (beyond 100 yards) you really need a 1 in 7" twist in your barrel's rifling as opposed to the 1 in 9" twist that the AUG comes with. But given the ease of switching barrels with an AUG, this should not be a problem to build a new barrel and have the end user pop it in himself.
Do a google search on mk262 5.56mm ammo, as I do not have enough posts here to be allowed to post links.
However, the AUSteyr would need to be re-engineered to accomodate this larger caliber and your ammo factories would have to switch over to making the new round.
As always, it is difficult to change calibers when one has already been established. It has certainly be done, but there is a lot of hesitation by the government/military.
The 6.8mm round is not in major production in the US, and all factories that make and sell mil ammo in the US are cranking out as much 5.56mm as possible for the ongoing wars.
The easiest thing to do with the 5.56mm is to go to the heavier 77 grain MK262 round, which has proven to put people down much down more effectively in Iraq and Afghanistan.
The only thing is that to use it at longer distances (beyond 100 yards) you really need a 1 in 7" twist in your barrel's rifling as opposed to the 1 in 9" twist that the AUG comes with. But given the ease of switching barrels with an AUG, this should not be a problem to build a new barrel and have the end user pop it in himself.
Do a google search on mk262 5.56mm ammo, as I do not have enough posts here to be allowed to post links.