I have to read this one. Sounds like a good article.

Is he saying that sectional density by itself is a reliable predictor of penetration?

OR is he saying that with today's current crop of Premium bulllets {hopefully specified} it is.

Reason I ask this is that sectional density is NOT by itself a reliable predictor fo penetration.

Two bullets come to mind; the Hornday .264/160 and the .308/220. Both are very long for caliber, but both are realtively frangible.

Others in past literature come to mind; Bob Hagel's poor results with the L-O-N-G .333/300, etc.

Since starting my testing program years ago, I no longer will make a prediction of penetration based purely on SD. A frangible long-for-caliber bullet may penetrate far less than a stoutly constructed lighter-for-caliber bullet.

Haven't read the article, but it sounds like an interesting one. Gotta get it. Thanks for posting RIPP.