I started to write almost the same thing last night, but held my thoughts. I have had a .300 RUM since mid '99 and it is a master of big game with a 200 grain bullet. I have gone as light as 165 & 168's with white tail deer, which it make short order of them like a .22/250 on prairie dogs. I also think you might get about a good day or two of life out of the Ultra barrel if you to go out like as I have and fired all day long at a couple of dog towns. You may even have a danger from burning your hands on the barrel, mine is warm after one shot and down right hot after two in a couple of minutes. I would guess after 10 shots in 10 minutes the temp would be near boiling water. You might end up with a stock that looks like a 98 Mauser that my Uncle brought back from World War Two, the wood around barrel is lightly charred. Good luck in any case!
Good shooting,
Marcus.
