Technology: Rangefinders can be key to hunt

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The days when big-game hunters had to rely entirely on dead reckoning to determine the distance to a trophy bull elk are long gone. Affordable laser rangefinders have taken much of the guesswork out of one of the most critical judgments a hunter needs to make.

A laser rangefinder can help hunters sight-in their rifles, calculate the distance to prominent landmarks that are visible from a hunting stand and confirm the distance to a target.

Longtime Steamboat Springs hunter Bill McKelvie said his Bushnell rangefinder is the first piece of equipment he turns to whenever he sets up in a new area for a stationary hunt.

"As soon as I sit down in a spot, I get out my rangefinder," McKelvie said. "I'll pick out a clump of trees and find it's 300 yards away and a big rock and find out it's 400 yards away."

Before any elk come into view, McKelvie has established in his mind valuable information that will let him quickly assess whether or not his trophy is in range.

Laser rangefinders made by well-established optical manufacturers like Nikon, Tasco, Leica and Bushnell range in price from $170 to $350 and up to almost $3,000. They work by calculating the time it takes for a pulse of infrared light to travel from the device to the target and back. It's a different technology from surveying instruments, which take wavelengths of light into account.

Generally speaking, the narrower the beam of light emitted by rangefinders, the more accurate they are in bright light and hazy conditions. Hunters will pay a premium for the narrowest laser beams.

The first thing a rangefinder does is help a hunter make ethical decisions about whether to take a shot.

"You might see what appears to be a big trophy bull and think it's at 400 yards and be tempted to take a shot," McKelvie said. "Then you get out your rangefinder and find out it's actually at 600 or 700 yards. You realize you'd better not take that shot."

Effective use of a rangefinder begins before the hunter goes into the field. Hunters go to the rifle range and select a distance at which to sight-in so they can adjust their scopes to account for gravity.

They make decisions based upon a range of factors that include the terrain they are hunting in, the type of rifle and rounds they use and the knowledge that brings about bullet trajectory and impact, plus their own comfort zone with their own marksmanship.

Judgment still comes into play. It's rare that a bull enters a clearing at precisely the distance and hunter has set his sights at on the range. But when a hunter has used a precision optical device to gauge the distance to the edge of the trees, and can quickly confirm target range, they are much better informed when they decide to set their crosshairs three inches above the kill zone, or three inches below.

The need for a hunter to determine accurately the range of a target has its basis in Newtonian physics and an understanding of gravity. Bullets travel at a rate of speed that the human eye struggles to detect. But Newton proved that no matter how high the velocity of a projectile, gravity exerts the same force on it as if it were dropped motionless. That means a bullet is falling toward the ground from the moment it leaves the barrel.

McKelvie said when he first began hunting, when he missed a shot, he typically over estimated the distance to his target. In the grand landscapes of the West, where hunters shoot across drainages, judging distance is a challenge.

McKelvie finds his rangefinder is even more critical when he hunts deer and antelope in the wide-open spaces of Wyoming. The smaller animals and the featureless plains make it even more difficult to gauge distances.

McKelvie can recall overestimating the distance to a bull elk, setting his crosshairs above the animal, and missing completely.

Even hunters equipped with rangefinders will constantly encounter situations where animals are either nearer or farther away than the distance their scope and rifle are sighted to. However, with refined information from the rangefinder, they can make much better judgments about where to place their crosshairs on the animal.

Rangefinders don't take skill and judgment out of hunting, and they will never be the most critical piece of equipment in a successful hunt.

"The key is having a good rifle that is sighted properly and you're comfortable with. The rangefinder helps build your confidence," McKelvie said. n

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