Before rangefinders came along in the late ’90s, most mule deer hunters were banking their long range shots on the power of the gun to produce a flat trajectory. For years, the 7mm Remington Magnum was near the top of the flat-trajectory heap. With a 150-160 grain bullet posting a ballistic coefficient over .500 and a sight-in of 3.25″ high at 100 yards, you could expect that bullet to drop about 24-26″ at 500 yards. That meant an on-body hold for big mule deer to about 450 yards. That math worked for decades but is also why so few big deer were killed beyond 450 yards; when you’re forced to aim at air, it’s just easier to miss.
You can read the entire article here Hash Marks or Turrets? A Mule Deer Hunter’s Perspective
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Read all about the weapon systems I prefer in my book: Hunting Big Mule Deer: How to Take the Best Buck of Your Life