Re: 7mm Remington ultramag barrel burner?
A smith told my that it depend more about the load than the caliber.
Hot load burn faster your barell.
The big pro(to mi) for the 7 ultra is that it can be shot with out break!! In my case.
Good choice of bullet and flat shooting.
338 ultra got more energie, heavier bullet and good momentun when hiting the target. But got to have a break.. In my case.
In resume bot are great caliber, go with the one that intrest you the most and have fun.
That my 2 cen