You can probably use your reticle for holdover to get you to 1000 yards. Using Hornady Ballistic calculator for 105 grain BTHP at 2675 FPS I came up with 36.61 MOA needed to get to 1000 yards at sea level. That equates to about 10.6 mils and many scopes have about 70 MOA of adjustment. If your at higher elevation you can probably get by without a canted mount.
I used 2.5” height over bore so your actual inputs will likely be a little different. Still will give you a ball park idea of your 6 ARC capability. With a 6.5 Grendel I like having a 20 MOA mount.
I probably had to much velocity if you have an 18” barrel. I was thinking about velocity out a 20” 6 ARC when I ran the numbers. I just looked at the Hornady load data for the 108 grain ELD and an 18” barrel they are getting about 2575 FPS. The 108 grain ELD-M has a better BC than the 105 BTHP so your elevation where you shoot might make a significant difference if you’ll need a canted mount.
I used 2.5” height over bore so your actual inputs will likely be a little different. Still will give you a ball park idea of your 6 ARC capability. With a 6.5 Grendel I like having a 20 MOA mount.
I probably had to much velocity if you have an 18” barrel. I was thinking about velocity out a 20” 6 ARC when I ran the numbers. I just looked at the Hornady load data for the 108 grain ELD and an 18” barrel they are getting about 2575 FPS. The 108 grain ELD-M has a better BC than the 105 BTHP so your elevation where you shoot might make a significant difference if you’ll need a canted mount.