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Your calculations are correct for conventional bullets and conventional thinking. However, the DGBR and DGBR-HP NonCon’s are very non conventional bullets and we have proven sectional density means absolutely nothing when it comes to penetration with these bullets. Think about this, our 62gr solid .223 penetrates 50 to 57” in the wet pack media. That is 2-3 times deeper than any spitzer or round nose type bullet of 250 grains or more including ours. This proves penetration has more to do with the nose profile than sectional density. The hollow point NonCons do not penetrate nearly as deep but the base still penetrates deeper than any spitzer bullet with the added devastating terminal affects. Also, when talking about energy, one must think about how much energy is transferred to the animal instead of total energy. Expended energy outside of the animal will absolutely do you no good when putting animals on the ground. I assure you our NonCon hollow points transfer much more energy to the animal than any bullet on the market even at substantially lower speeds while still producing pass through performance. Don’t get me wrong, the faster they are traveling when they hit the more devastating they will be but even at slower speeds you will not have an issue with absolutely pounding the snot out of any animal down to 1600fps impact speed. You can see the difference impact speeds make on Michaels AR thread with the new 130gr .308 bullets he tested in a 308 Winchester and 300 win mag. http://forums.accuratereloading.com/eve/forums/a/tpc/f/4711043/m/2861098911/p/188