MTMilitiaman
Member
The 6.5x43 NATO M666 115 gr FMJBT:
Take the 6.8 SPC and neck it down to 6.5mm. Equip this with a 115 gr FMJBT of construction similar to the Yugo M67 with a large air pocket comprising the forward 1/3 the length of the bullet in the nose. With a muzzle velocity of about 2500 fps from a ~14 inch barreled carbine, this load would produce recoil very similar to the 6.8x43 or 7.62x39, both of which are controllable enough to be useful in full auto with proper trigger discipline, but with better exterior ballistics than either. The 6.5x43 shoots a bullet of identical mass at nearly identical velocity to it's parent cartridge, but does so with a more streamlined and aerodynamically effecient projectile that resists drag and retains velocity better. The 115 gr .264 cal has an SD of .236, compared to the 115 gr .277 caliber SD of .214 and the 125 gr .310 caliber SD of .186. In addition to it effect on BC, the higher SD should mean the 6.5x43 will boast better penetration than either of the other cartridges with similar projectiles. And the bullet design is simple, so it should be cheap and easy to produce in quantity with good accuracy and consistency.
The bullet design does shift away from traditional American wounding mechanisms relying on fragmentation as the primary wounding mechanism. While the M666 ball round does have a cannelure, which can increase the likelihood of fragmentation, this is not its primary wounding mechanism. Rather the bullet relies on a more traditionally Com Bloc design featuring a large air cavity in the nose. This makes the bullet very long for its weight and caliber and places the center of gravity further to the rear. This increases the bullet's tendency to tumble and yaw during penetration. When combined with the bullet's increased length, this drastically increases wounding potential without being reliant on velocity like fragmentation.
Other than tracer and AP rounds, the cartridge would also be designed with a long-range anti-personnel match round featuring a VLD HPBT type projectile of ~117 gr. Because the design of the standard ball round necessitates a pretty fast twist to stabilize, the heaviest possible round that can fit in the magazine should be utilized, even at the cost of reduced velocity, as a.) this projectile will most often be used in a ~18 inch barreled sharpershooter version of the standard infantry carbine to maximize velocity and portability, and b) the increased BC will more than likely make up for reduced muzzle velocity downrange where the round is intended to be used.
And here's the really cool part...
All you're doing is making another caliber conversion for the SCAR 16S and adopting it as the standard infantry rifle. The standard carbines get an Aimpoint CCO. One sharpshooter version equipped with a Trijicon RCO is given to one of the top shooters in each fire team. As per usual, the fire team leader is given an underbarrel grenade launcher. A demo or breaching expert with a ~10 barreled sub-carbine might also be assigned.
Just found this, it looks like it would work too. http://forum.saiga-12.com/index.php?showtopic=30020
Take the 6.8 SPC and neck it down to 6.5mm. Equip this with a 115 gr FMJBT of construction similar to the Yugo M67 with a large air pocket comprising the forward 1/3 the length of the bullet in the nose. With a muzzle velocity of about 2500 fps from a ~14 inch barreled carbine, this load would produce recoil very similar to the 6.8x43 or 7.62x39, both of which are controllable enough to be useful in full auto with proper trigger discipline, but with better exterior ballistics than either. The 6.5x43 shoots a bullet of identical mass at nearly identical velocity to it's parent cartridge, but does so with a more streamlined and aerodynamically effecient projectile that resists drag and retains velocity better. The 115 gr .264 cal has an SD of .236, compared to the 115 gr .277 caliber SD of .214 and the 125 gr .310 caliber SD of .186. In addition to it effect on BC, the higher SD should mean the 6.5x43 will boast better penetration than either of the other cartridges with similar projectiles. And the bullet design is simple, so it should be cheap and easy to produce in quantity with good accuracy and consistency.
The bullet design does shift away from traditional American wounding mechanisms relying on fragmentation as the primary wounding mechanism. While the M666 ball round does have a cannelure, which can increase the likelihood of fragmentation, this is not its primary wounding mechanism. Rather the bullet relies on a more traditionally Com Bloc design featuring a large air cavity in the nose. This makes the bullet very long for its weight and caliber and places the center of gravity further to the rear. This increases the bullet's tendency to tumble and yaw during penetration. When combined with the bullet's increased length, this drastically increases wounding potential without being reliant on velocity like fragmentation.
Other than tracer and AP rounds, the cartridge would also be designed with a long-range anti-personnel match round featuring a VLD HPBT type projectile of ~117 gr. Because the design of the standard ball round necessitates a pretty fast twist to stabilize, the heaviest possible round that can fit in the magazine should be utilized, even at the cost of reduced velocity, as a.) this projectile will most often be used in a ~18 inch barreled sharpershooter version of the standard infantry carbine to maximize velocity and portability, and b) the increased BC will more than likely make up for reduced muzzle velocity downrange where the round is intended to be used.
And here's the really cool part...
All you're doing is making another caliber conversion for the SCAR 16S and adopting it as the standard infantry rifle. The standard carbines get an Aimpoint CCO. One sharpshooter version equipped with a Trijicon RCO is given to one of the top shooters in each fire team. As per usual, the fire team leader is given an underbarrel grenade launcher. A demo or breaching expert with a ~10 barreled sub-carbine might also be assigned.
Just found this, it looks like it would work too. http://forum.saiga-12.com/index.php?showtopic=30020
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