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I've tested high SD bullets that penentrated no more deeply than bullets with much lower SD's. Just because a bullet has a low SD doesn't mean it will automatically penetrate less.

All things equal in two bullets of identical construction, SD means something. As a guarantor of penetration in and of itself, not much anymore.

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Try plugging the following phrase into you search-engine of choice.

"Terminal Sectional Density"

There is a school of thought that the SD after impact and full expansion is a far better indicator of penetration than unexpanded SD.

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