Re: Long Range Flat shooter??????
If you are going to shoot mainly in 130-140 grain, I would go 6,5. The new sirrico II 130 grains has a BC of .571..
Maybe a 6,5-06. Only gives 200 fps more than a 260
The 7mm is nice from 140-150 in a 7-08 with hunting bullets in .5++ BC. If you want a higer bullet weight, you need to step up to 280. I would go for a 280AI just for the fun of it. You only get 100-200 fps more with a 24"-26" barrel. But thats almost equal of the 7mm Rem Mag with 10 grains less powder.
But, since you have along action, the 6,5-06 or 280AI, seems to give the best compromise. Where I live, the minimum weight of a bullet is 140 grain, so my pick would be a 280AI.