In a way nothing wrong with all calibers mention above.
My concern is just the efficiency of them.
A 270 130 gr goes around 3050 fps .
When you can push a 308 130 gr barnes with similar BC at around the same speed in a shorter barrel and short action why stick with those big boomers?
Same thing with a 25-06 Vs a 6.5( be it creedmoor, 260 or 47) .you can push a 120 gr at similar speeds.
The 280 and 30-06 ( and the improved versions) are another class of their own.that is another story.
My 2 cents.
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