05-26-2013, 12:06 PM
jsolo Wrote:I want to find out if my alexander arms 6.5 grendel which has a 18" barrel fluted the upper is viltor mono.The rifle is a gas piston.Is there any way I could out shoot my remington it has a 20"barrel with the acc cap for a supressor.It also has a AICS chassis and a harris bipod.I would want to shoot from 800 to 1000 yards.I would use hornady 123gr a-max 6.5 grendel I will have to get some match ammo for the 308 and will use a millett LRS 6x25x56 on both rifles. My question is this will the grendel shoot better groups both guns have very low rd. counts the rem. is a 700 sps tactical acc sd 308cal.
JS:
The answer is your stock Remington 700 SPS has a better chance of shooting more consistently than any stock semi-automatic rifle.
Neither is a good choice for 800 - 1000 but you can get away with hot loading your 700 and you absolutely will not get away with hot loading a AR-15.
If both bullets are marginally close in BC and both cartridges are marginally close in velocity, the exterior ballistics will be so close that you won't be able to tell the difference. So, your 2550 fps 123 A-Max load (a pretty stiff load for a AR-15 Grendel) and a 155 Sierra or Berger going at 2650 fps (a mild load with a 700), will not be significantly different. Same with a 175 Sierra @ 2600.
This leaves accuracy as about the only factor to compare. Bolt guns have the advantage hands down so you are now left with barrel quality. And you won't know that unless you have found one barrel simply will not shoot any loads well. Which means you got to test them.
So, you need to test both, and do so without prejudice.
LR1955