The 200 gr ULD RBBT came about as a result of a project to get high performance handguns performance to reach out one mile. The rounds used were 7mm WSM
and a wildcat 7mm-270 WSM(Norma brass).
At the same time Richard and I were also designing my 7mm Allen Mag which is also designed around this bullet and should be on the range here very soon to test.
You will need a 1-7 twist for this bullet. I had Dan Lilja get tooled up to build 1-7 twist 3 groove barrels for my 7mm Allen Mag to help increase throat life.
For this size of a bullet you really need to get into something at least the size of a WSM case and I would prefer using a 7mm Rem Mag case capacity as a minimum. Yes when loaded to the same pressures, the Rem Mag will out perform the WSM by a full 100 fps despite the magical claims of the WSM maker!!
If your looking for 5000+ round barrel life, I would highly recommend looking at the 7mm-08 because thats about the only round that would have a chance to reach this level.
As mentioned earlier, there is a price to be paid for performance and this comes in the price of shortened barrel life.
The 280 AI is a great round but I would not recommend it being loaded with the 200 gr Wildcat ULD RBBT. Like I mentioned, move up to at least a WSM or better yet a 7mm Rem Mag for a minimum with this bullet. The 7mm STW, 7mm RUM or 7.21 Firebird are also great high performance choices and then the next step up, the 7mm Allen Mag.
All of which will limit your barrel life but if properly cared for you will get 1200-1800 rounds of barrel life. That may sound like a very short life but unless your shooting P dogs every weekend or in comp with the rifle, this is quite a bit of life.