All Of our optics are rated up to 50 BMG and will handle anything you can reasonably fire from the shoulder. However it needs to mounted properly and with precision.
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As long as the Action is a short action I would recommend the A293 Rem 700 SA 20MOA rail and a set of A224 34mm 1.125" high rings.
For that setup, the 34mm rings would be a great option. The height we'd recommend would be the 1.375" X-High rings which is part number A226 (4 screw rings) or the A214 (6 screw rings).
I would recommend either the Ultramount, or the Unimount in 0MOA as the Ruger already has incline in the base.
That is a haul for a 6.5 Creed. Not that it can't be done, folks do it all the time. A 6.5 goes transonic at about 1200-1300 yards meaning the drop increases exponentially at that point so you will need something that has a lot of holdover. I like the Mil-XT, or the Tremor 3, something with a grid giving you wind holds below the horizontal.
The scope can be focused down to 11 yards. Whether 7x will be too much magnification will depend on your hunting style. If the primary use for this optic is hunting with 50-100 yards, you might consider an optic with less magnification, like our ATACR 4-20x50mmf1 or our ATACR 4-16x50mm.
Yes flip up tenebraex lens covers come with this optic.
We would recommend The A295 Remington LA 20MOA base and a set of A210 XTRM 6 screw high rings.
For that particular set up we would recommend the A216 XTRM - Ring Set - 1.5" XX-High - 34mm - Ultralite™, 6 screw.