08-23-2012, 11:48 AM
The truth is that neither of them are ideal at those distances, as they are really meant for the 600yd/m line. When the wind kicks up even a tiny bit, they're all over, like a .308 168gr or even 175gr at distance.
We're really stretching the repeatable ballistic potential of the Grendel when shooting at these distances, namely 700yds+, and it is exceptional that Azprc was shooting a freaking 12" plate at 1084yds with a 20" barreled anything, let alone a 31gr powder capacity cartridge. If you pay close attention to the 1084yd video, you're looking at a full value wind from right to left at the target of no more than 2-3mph, with unkown wind in-between.
If you were to have even a light 5mph full value wind anywhere along the bullet's flight path, I doubt you would see any possibility of holding a 108gr within 1 MOA of accuracy, let alone being able to make predictable 1st-round hits on a man-sized silhouette.
That said, the Grendel still is an amazing little cartridge for what it is, and does really well in low-wind conditions past 600yds, as evidenced. When I run my ballistics to see what kind of 1st-round hit probability I can get on a silhouette, I look at the 10mph windage column, paying attention to when the 1.0 Mil drift is exceeded. I look across to the range, and then I have an idea where I'm 1st-round effective to, and that's with accurate, up-to-moment wind calls, maintaining exceptional marksmanship given the pressure to shoot in the conditions.
If you guys are looking to get some more velocity from the 108, maybe you can find some Moly-coated pills, or coat them yourself, and continue to load them long, with more powder. I'm getting crazy velocity from the 123gr Silver Scenars loaded by Precision Firearms in my 16" Grendel, so I just may try the 108's too at distance to see what I come up with, although I usually shoot my .260 Rem at distance out in the desert, where the winds are usually pretty significant.
We're really stretching the repeatable ballistic potential of the Grendel when shooting at these distances, namely 700yds+, and it is exceptional that Azprc was shooting a freaking 12" plate at 1084yds with a 20" barreled anything, let alone a 31gr powder capacity cartridge. If you pay close attention to the 1084yd video, you're looking at a full value wind from right to left at the target of no more than 2-3mph, with unkown wind in-between.
If you were to have even a light 5mph full value wind anywhere along the bullet's flight path, I doubt you would see any possibility of holding a 108gr within 1 MOA of accuracy, let alone being able to make predictable 1st-round hits on a man-sized silhouette.
That said, the Grendel still is an amazing little cartridge for what it is, and does really well in low-wind conditions past 600yds, as evidenced. When I run my ballistics to see what kind of 1st-round hit probability I can get on a silhouette, I look at the 10mph windage column, paying attention to when the 1.0 Mil drift is exceeded. I look across to the range, and then I have an idea where I'm 1st-round effective to, and that's with accurate, up-to-moment wind calls, maintaining exceptional marksmanship given the pressure to shoot in the conditions.
If you guys are looking to get some more velocity from the 108, maybe you can find some Moly-coated pills, or coat them yourself, and continue to load them long, with more powder. I'm getting crazy velocity from the 123gr Silver Scenars loaded by Precision Firearms in my 16" Grendel, so I just may try the 108's too at distance to see what I come up with, although I usually shoot my .260 Rem at distance out in the desert, where the winds are usually pretty significant.