I was reading an article lately about how they've tested the 338Lapua and since it's naturally an accurate caliber (which is more important then one might think) it's also got a predictable tradgetory as well. 50cal shooters know that all too well. The article mentioned too be able to punch through 12mm of armour out to 500meters. The 26" barrel, like I said can be swapped out for a barrel up to 31" but a 29" barrel will give the long distance results everyones looking for.
Also the bullets you use to punch holes in paper while you're doing your load testing will be a 300gr Sierra Match bullet but also an awesome big game killer past 400yds when the bullets stablize and not just zip through the animal. Of course bullet placement is everything but being a little bit slower moving bullet (300gr) the barrel will last longer then shooting some of the faster comparative guns like mentioned. If you don't know already who is bringing them in, PM me and I'll give you more info.
Thanks for all your input. Anyone reading this thread for the first time will definitely learn lots about long range precision rifles and that's what it's all about.