The .243 win will do the job with decent bullets easily within your range. If you could get factory loads with nosler accubonds or barnes tsx bullets , these work really well along with nosler ballistic tips as well. The .308 would do it as long as the loads you are referring to , hornady custom lite. If you call hornady or some of the other manufacturers they will glady help you select the correct ammo. A tidbit of imfo is the 30-30 Winchester has killed more deer than any other cartridge to date with the 30-06 coming in second. The .243 should be practiced with a lot to make sure they can hit the boiler room. If they can shoot the .243 will rule.
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