12-30-2011, 11:31 PM
Kinetic energy at the target is OK as long as you are looking at about the same caliber and bullet.
Penetration depth and expanded bullet size are better indicators when going over large differences in caliber and bullet weight.
We get that metric by taking the momentum density (m*v/dia^2) and multiplying by the weight (m). I know it sounds strange, but Steve Johnson worked that out while he was at Hornady and it seems to make sense. The method is implemented at http://www.hornady.com/hits/calculator.
The Grendel fares very well against the .243 Win, .257 Roberts, and 30-30 as well as being significantly better than the 6.8 SPC when using this metric.
Penetration depth and expanded bullet size are better indicators when going over large differences in caliber and bullet weight.
We get that metric by taking the momentum density (m*v/dia^2) and multiplying by the weight (m). I know it sounds strange, but Steve Johnson worked that out while he was at Hornady and it seems to make sense. The method is implemented at http://www.hornady.com/hits/calculator.
The Grendel fares very well against the .243 Win, .257 Roberts, and 30-30 as well as being significantly better than the 6.8 SPC when using this metric.