Not saying I agree with Llama Bob but I'm curious which bullet manufacturer personnel you spoke with to get this information? The reason I ask is because when I made a phone call to hornady and visited with Steve he told me that there higher sectional density offerings works better for penetration both in the field and in medium.
Next time you're on the phone with Steve ask him why his 6mm-80 gr GMX (SD @ .193) retains approx 100% of its weight and will easily out penetrate his 6mm-103 gr ELDX (SD @ .249), which retains about 50% or so of its weight. The ELDX has a SD that is 29% greater than the GMX. I'm guessing its probably because the material engineering makeup is different and deigned to give a different performance characteristic, what do you think? SD is a constant, however I can change bullet performance by changing the variables in material makeup and bullet construction to render the constant meaningless when it comes to penetration.
