Re: .338 Edge bbl life
I quit doing the 7mm-300 RUM in 1999 because it ate up barrels worse than a 30-378 wby. 500 rounds is about right. But then it depends on how you shoot it, clean it, etc.
I doubt you need to worry about barrel life with the 338-300 RUM. To my knowledge all the ones I did for guys all over the country from 1998-2001 are still going strong. I still have two of those original rifles from 1998-1999 time frame and they still shoot great after who knows how many rounds on the range at my old shop. I am sure guys have more than 1500 rounds on a few of those rifles. That is one of the great plusses of doing a long range rifle in 338. Barrels will last you a lifetime. High performance 300's not as long and 7mm's not long at all by comparison.
Your choice is a great cartridge with long barrel life, thus their popularity. Do not plan on seeing 2900 fps out of it though. You may, and it is possible with a real fast barrel but expect your best accuracy to come in from 2750-2850 fps.
Predictions are difficult, especially when they involve the future