For me 270s kick to much for what they are but plenty of people use them successfully and 500 yards is a fair range for the 270. Any caliber above 243 will do what you want id look at the 308 for cheapness of ammo , you will find cheaper ammo for the 308 than any other center fire except 223. Its c apable out to and past 500 has massive pill selection and inherently accurate.
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