The differecne between the calibres is pretty negligible.
Are you asking because you have been offered a 270 and a 308? The differences between them will be more likely down to the differences between the rifles themselves....Make model, age and wear etc... I doubt many shooters will wear out a new rifle in a lifetime but some rifles will outlast their owners by a number of lifetimes ( I shoot a couple that are older than my father.....) so that is worth looking at....
The previous advice regarding the ammo and what mates shoot is very practical. One thing that will really help a newer shooter is ractise, and that costs ammo so see what is available, and affordable in the way of ammo. Go into your local ammo suppliers and see what they carry more of- it will probably be 308 at a guess....That woul dbe the way I would go.
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