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The AR-10 Build in Mammoth Sniper Challenge

By Christopher Roberts

It was a cool, partly cloudy January morning when my partner Chris and I had just navigated a 30-foot tower and engaged one minute of angle (1 MOA) targets out to 500 yards. Since Chris was running a LaRue Tactical OBR chambered in .308, these targets were well within his grasp. After his engagements, we ran back down the narrow tower stairs to a dirt berm, where I had only a few minutes to engage multiple targets out to distances of 1000 yards. I was using an AR-10, built in my garage, chambered in the formidable 6.5 Creedmoor. We ranged my first target at 736 yards, I dialed on 5.1 mils. Chris told me to hold left edge of target, and I broke the shot. Ringing steel echoed out across the range, assuring a solid hit. Immediately, I transitioned to my next target, roughly 50 yards further. I held a little high and sent a round downrange, impacting just off the right edge. Thanks to my Leupold Mark 4 ER/T equipped with Horus 58 reticle, I could see splash. After a shot correction, I quickly sent a second round downrange; impact!

Shortly after, we packed up our kit and began our final foot march. In the course of two days we covered 35 miles. In the end, we took 11th out of 43 teams in the tough man division of the 2018 Mammoth Sniper Challenge. I was elated to have my first shooting competition under my belt.

Mammoth is the type of competition where physical endurance and the extreme edge of precision meet. Joe Harris, the match coordinator, likes to put you in awkward positions and then give you slivers of a target to shoot at. What made this entire situation more complicated was the fact that 4 weeks before the competition I had no rifle. I knew that we would have to engage multiple targets rapidly, so, in my mind, the choice was easy; I would build a 6.5 Creedmoor AR-10 as the primary shooter. With its proven track record in respects to...

This article first appeared in Small Arms Review V22N6 (June 2018)
and was posted online on April 20, 2018

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