Paul
what range do you have them at right now?
.270 should be comparable in range to 30-06 since it has flatter trajectory than .30 caliber.
As for .243 is based on the .308 case but has smaller bullet so it shoots flatter also at longer range.
I guess it depends on what "magnum" range is.....they shoot 5.56 (77 grain bullets) at Camp Perry 1000 yards
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