Thanks for the quick reply! Mostly the gun would be used for longer range elk hunting,
Popular elk calibers span from 6.5mms, the 7mms, the Thirty Cal mags, and up the 338s.
Coyote hunting in the Arizona flats,
Any of the above calibers would do well here.
and long range target practice.
This should point you towards a caliber that has high quality brass available, and isn't overbore so the barrel lasts you a bit.
By long range i mean 500 yards and out. I would love to shoot 1000 yards but dont have the knowledge to do so.
But is sounds like you soon will
But it's very smart of you to realize the limitation in your whole "system" (i.e. laser, ballistic computer, shooter, spotter, optics, etc), but I would build it towards that realistic future 1000 yd goal in mind.
I do have a friend I reload with, the hand loads we have made for my 223 are super accurate. Reloading for another caliber would not be dificult.
This will put affordable practice in reach, and help you obtain the precision you need to be successful at those distances.
Do you have a desired weight for this rifle?
If you're a truck/atv/road hunter, or very physically fit, than a 17-18 lb 338 might be the ticket. If your only vehicle while hunting are two LPCs (Leather Personnel Carrier) than the weight part of the rifle can play a role. It's just my humble opinion, that all the potential bad things going on during the recoil impulse makes lower recoiling rifle easier to shoot precisely/consistently. Your desired build weight may sway you to look at the smaller calibers. So what do you want this rifle to weight when it's all said and done?
Do you hunt with a horse/ATV scabbard that would potentially limit the overall length of the rifle? Do you have a desired overall length in mind?