FMJ yaw and upset performance

[stanc]

The longer 6.5 bullets could provide the same tracer burn or comparative to 7.62 NATO, and 800m will cover most engagements with the belt-fed guns, but will require a longer bullet to house the magnesium for a good burn.

Since there are so many restrictions on machinegun ownership, we are limited in how much RDT&E we can do because of the costs associated with obtaining an 07 mfg license under an FFL, whereas we can tinker around with this cartridge in our AR's all day long.

Yeah. One way it might be possible to tinker with a belt-fed is maybe conversion of an RPD or Czech vz52 LMG. However, I dunno if the taper of 7.62x39 links would work with the straighter Grendel case.

The only other option I see is to build a 6.5 upper similar to that of the 5.56 Colt "LMG" and put it on a full-auto lower. Not entirely satisfactory, to be sure, but perhaps it might be good enough to serve as a "test bed" of sorts? (This idea was discussed on the old forum, wherein Variable expressed an interest in trying it, but only if it could be done to his standards... )