Thsi is the phrase which worries me. Is this supposed to be 500 meters effective range or maximum range? Unless the RFP is written to specify, a smart contractor could use this ambiguity to tie up a competition reward in protest.
Of greater concern to me is logistics. If the military is going to a new rifle will its cartridge be compatible with being used in existing SAW-type belt-fed weapons ? I’m attracted to the Remington modular concept, but how “soldier proof” is it ? The advantages of even single-caliber modular designs are obvious, but ready bullet selection/optimisation for specific tasks might be even a better benefit to small unit commanders.
I tend to favor the 7mm caliber as if offers excellent ballistic profiles and a range of useful bullet weights and would certainly address the reputed “500 yd. range”, issue. With alloys, inserts and controlled-expansion options bullets can be tailored to the need and weapon profile. Of course that flexibility raises further logistics issues...... >PS