I am always interested in reading someone's findings when they do standardized bullet penetration tests. I think it can help immensely for a hunter trying to decide on a bullet that's actually up to the task at hand. Anyway, I recently read a very good one on the .444 Marlin.
The fella who did the test used both jacketed bullets and cast ones. The results were pretty darn interesting, ESPECIALLY when he threw in a wild card, a 30/06 shooting a 180gr Barnes "X" bullet to be tested in exactly the same manner as the .444 bullets.
Quite an eye opener. There were at least 8 bullets of the ten tested that equaled or bettered the 180gr X's performance of penetrating 6 gallon jugs of water. Only two of these bullets were cast ones, by the way. I was truly impressed and seeing some of those huge mushrooms and one bullet (300gr JHP) that penetrated 8 jugs and retained nearly 90% of it's original weight was quite darn eye-opening to me.
By the way the SD of a .30cal 180gr is .271 and the SD of a 300gr .429 is .232. Even a couple of lightweights, 265 & 270gr matched or exceeded the 180gr "X". They have a lowly SDs of .205 & .210 respectively.
Gotta love those big bore rifles!