Want to work up to 1000yd...need build advice on the reasonable for the rifle

[biodsl]

I shoot at lot out to 1,000 yards here in PA. The 1,000 yard range has a altitude of 600 feet. What the Grendel is capable of at 6,000 ft altitude is all together different and more than at 600 ft. So I'll give you the PA answer and somebody else can give you the WY answer.

And there you have it. Great reply, Gusmeister. A ballistic calculator tells the tale.