Re: AR-10 or M&P.300 WHISPER ???????
The "Chief" has a good point; the 6.5 Creedmore is a fine LR cartridge and in the AR10 platform is righteous! Also, I just got a hold of the 120 gr. Hornady GMX. That's one looong bullet! Should have a high BC and great at long range; if you can make it shoot accurately. I haven't tried it yet. I got it for a Grendel, but I think it's way too long for it. Should work in a 260 or Creedmore though.