Greetings @Edelweiss,
Being an old Fudd I would go for the 7mm-08 on the basis of long term availability of brass alone. You will need a longer mag and faster twist barrel than standard though if you want to shoot the long pointy projectiles. I am currently using one shooting 600 yards (550 metres) F class and the rifle and cartridge are not the weak links, it is the shooter. The rifle will be lighter for the same recoil as well.
Regards Grandpamac.
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