I Googled and have been looking for penetration testing for Double rifle bullets with various Sectional Densities and have found only 2 on big bores-one at 470mgobo.com and another by Charlie Haley in African Hunter Mag Vol 5, No.6,Dec 1999. Any others out there I didn't find?

The African Hunter Article was interesting as a older 500 gr pill from a 458 at 1950fps only penetrated HALF as far as newer technology 500grainers at 2180. The SD was obvioously the same. 458-Kinda a hunters death pill at 1950fps when hunting Ele. Just p*ss them off good enough to stomp you into mud.

I am interested on estimates of how the penetration will decrease with similarly constructed solids with different Sectional Densities ie a 0.32(577/750gr) versus a 0.28(577/650gr) at similar velocities.

Sorry for all the BS-Velocity/SD is critical to penetration on Ele-How low can you go?