What is 300 Whisper equivalent for 308 AR lower and brass?
 

What is 300 Whisper equivalent for 308 AR lower and brass?

I have quick barrel conversion capability on both my LMT MRP and LMT MWS. I recently got and have begun to experiment with my new 10.5" Noveske 300FB barrel but would like to try the same concept on my 308 lower.

Have any pics or point me to examples? I'm mainly concerned with subsonic so curious about heaviest possible to 1075 while getting AR308 to cycle.

I presume you are speaking of the AR10 type rifles. If so, the 302 whisper will give you what you are looking for if you are set on 30 caliber. If willing to go up in caliber, the 338 whisper on the 7mm BenchRest case has a good following as well.

The 338 was recently discussed here:
http://www.quarterbore.net/forums/showthread.php?t=4374

I am slowly developing one based on the .308 case and either .375 or 10mm bullet to work in the AR10. I have no idea when it will be ready to test....