Indeed. SIG 716 for the Army, one can only dream.
That being said, I am sure we could tweak the 223 to go 100 grains and high pressure. It would be very close in performance to regular 7.62
“That being said, I am sure we could tweak the 223 to go 100 grains and high pressure”
While you might be able to load a 100 grain projectile into a 5.56 mm case there wold be so little room for propellant you’d never achieve enough velocity to make a effective cartridge. I load 55 grain soft points into 5.56 brass and 24 grains of powder darn near fills the entire case. That give me about 2900 fps or so if memory serves.
The only way to “tweak” that case for a 100 grain bullet would be to lengthen it. Then you’d have to redesign the entire gun.
I had heard about a 5.56 blackout? round that had the same ballistic footprint as a 7.62 but have not been able to find any for sale.