Grendel as a Universal Infantry Cartridge

[Tony Williams]

Next question: Is it better to just push for 7mm UIAC, since that cartridge (and a 7x46 GPMG!) already has been developed and there's some data for it? Or is it worth spending the time (and money?) to "study" the possibilities of 6.8 and 6.5 versions?

Since the 7x46 info says (with a 130gr bullet) it has 7.62x51 muzzle velocity, is it likely that a 6.8x46 w/120gr bullet and 6.5x46 w/110gr bullet would have approx the same MV? Or would 6.8 and 6.5 loads need even lighter projectiles to match MV?

It's a matter of which compromise strikes the best balance of advantages. I don't think there's a lot it in, but given that IMO 6.5mm is the minimum to do the job and 7mm the maximum, I now tend towards 6.8mm.