Good question.
The 6.5 Grendel is an AR 15 platform based round. It is loaded with medium light bullets ( 123s, to optimize its rather moderate powder capacity. It runs a comparatively inefficient bullet ( bc of about .520 per hornady manual) at rather mundane speeds ( again, due to the moderate powder capacity.
It is basically limited by its size on the small end of the spectrum.
Another concern to many smiths and shooters is that the chamber walls are rather skinny compared to what the industry considers acceptable- The case eats up a lot more of the Ar 15s barrel max diameter compared to the 6.8 case ( 30 rem) or the 55/223 case.
I doubt the SOCOM folks would look to barely match the 308 win with a 168 with a 6.5 with a 123....
The Grendel is a neat step in the development of the ideal AR 15 platform cartridge- which I personally think is the semi-custom 240 Tomahawk of Keystone Accuracy. It is a 6.8 SPC necked to 6mm and it runs 105 Hornadys ( bc of about 540) to 2850fp- as about a sweet shooting target rifle or light game rifle. The winning cartridge these days at camp perry across the course is an AR 15 based 6mm.... Easy to shoot, extremely accurate and precise.
Thank you for the info about the 6mm. I’ll have a look at more details.
I didn’t read slowly enough to notice that the article is about sniper rifles. Either the .260 or 6.5 Creedmore would be a good choice, if necessities other than ballistics would also work out well.