im looking into buying my first precision rifle im pretty much settled on the remington 700s because it seems like the aftermarket loves them but should i be looking for one in 308 or 300? most of my shooting will be at my house (600yd range) but i really want to be able to stretch out to 1000+ ill also be going elk hunting with it next year if that matters and ill be reloading for this setup

also ill be wanting to run a shorter barrel 22" or so but from my research this wont really effect either caliber