No real downsides for the ranges that you talk about..
Personally for me a 270 needs 24 inches of barrel to work well, its a bit blasty, kicks a bit in a light rifle, factory loads out of a 22 inch barrel with 130s tend to be around 2900 fps up around 3100 with hand loads but I can achieve 3000fps with a short actioned 20" barrel 7mm-08 and 120gr pills, and 3000 fps with 16" barrel 308 and Barnes TTSX 130 pills... even with cans they are still handier
Shorter handier rifles similar performance... for the 0-300 stuff...
over 400... more projectile choices with better BCs in 7mm and 6.5mm
but its all reasonably academic for what you have described..... if you want to shoot longer you might want to consider something else, but thats not likely to include the 708 or 308 anyway...
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