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

[bob4432]

After messing with Hornady's Ballistic Calculator and Google Earth (for altitude), turns out I am not going stay supersonic or even close to 1000yd, maybe 800. The ranges where I will be shooting are about 300-500' higher than where I live, and when you add realistic air variables (less barometric pressure, need to read how that plays in), I think I was ~800fps @ 1000yd. So my plan is to step build - build a 600-800yd Grendel, still wanting to stay with a 16" barrel (I really like the size) and then when I become proficient at which I am supersonic at, move up to a 6.5Creedmoor. Figure it is the most cost effective way to get to 1000-1200yd being I would buy the optic for 1200yd or so, and on the reloading size, I can cross-pollinate bullets and primers, using Lapua Small Rifle 6.5Creedmoor brass. Trying to do this as cost effective as possible. I also have to remember that in the summer in Phx, AZ, we will stay no lower than 90F+ 24/7, so some people have a 'No Shooting in the winter, here it is limited shooting in the summer, as soon as the range opens".

Now, that I am going down 2-400yds, would a Faxon, BA Hanson or Green Mountain Barrel be adequate? Thanks all for the input and giving real world realities.