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Not true.A shorter barrel is stiffer and has less flex otherwise known as barrel harmonics. Therefore , all other factors being equal , a short barrel should be more accurate than a long barrel.
At least for any reasonable range where you don't need the fastest possible velocity to combat wind drift or extreme bullet drop.
18 inch barrel 308 should give you excellent tight groups out to at least 600 yards and satisfactory performance to ring big steel plates at 1000.
