 Left to right, 6.5 Grendel, 30-30, 30-06 Originally published 11/07/2021 updated 01/09/2025 There is no shortage of strong opinions on the best rifle caliber for harvesting Whitetail Deer and Blackbuck. At the Wild Rocking P we've harvested enough game to know we had to set a minimum caliber or round. We know the .243, 300 Blackout, .223 may be enough for the accomplished shooter or perfect shot; however, not all shots and shooters are perfect. After much research and a fair amount of experience, we've come down to understanding Chuck Hawk's Kill Potential Score and set the minimum KPS at 20 for 100 yards. That list starts at the minimum with a 100 grain 25-06 travelling at 2316 Feet Per Second generating 1,858 foot pounds of energy at 100 yards and a Kill Potential Score of 20.87. That round has dropped a nice 165 pound 8-point buck the first year and for the past three years. Next up the list is the 6.5 Grendel and on up the 30-30, .308, 30-06, and so on up to the 300 Winchester Magnum. We use an autoloading 6.5 Grendel with young hunters, its light weight and low recoil score of 8 pounds mostly absorbed in the autoloading action, producing a KPS of 21 make it a favorite. We also use a lever action 30-30 150g with 10.6 pounds of recoil and a KPS of 25.9 and a 308 SFAR launching a 150g bonded bullet, generating 15.8 pounds of recoil that is absorbed in the autoloading action and produces a 34.7 KPS. Compare that to our bolt operated 30-06 150g core-lokt with a recoil of 17 pounds and a KPS of 38. These four rounds have something in common, a perfect record of one-and-done harvests. We find youth, women and first time hunters have an easier time with managing light weight autoloading rifles. They can be easier for seasoned hunters too. Although some of us still prefer the lever or bolt of our youth. Not sure where your favorite rifle round lands on the list, you can download the list or click on the link below. We're not rifle or ammunition snobs, we're just commited to one-and-done ethical harvesting of game on the Wild Rocking P. 
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