If you are set on a 280 then nothing else will do.

But, if you don't want to shop much and could settle for the 270 you will be able to find a ton of rifles in that chamber. And if you will never reload then you'll be fine with the 270. The 280 offers a slight advantage in bullet selection, but modern bullet construction makes the difference almost negligible.

Good luck on your search for the 280 you want. A great round for sure, just less owned than the 270, but certainly not less effective.