Depends on how hard the lead is - hard-cast bullets will not expand a significant amount
A given, but the essence of using lead is trial and error until you find what works the best. Bear in mind I am speaking of a flat pointed ( that sounds wierd) bullet. See the designs with the wide flat tip. http://www.leeprecision.com/cgi/catalog ... lmol2.html
Is this necessarily a bad thing if the design intent of a hollowpoint is to expend all its energy in the target and not exit? Does jacket separation result in significantly less penetration of the lead core? If the two components take separate courses within the target, might not the additional damage that results more than offset and decreased penetration?
The jacket is light enough that it will not usually create much damage on it's own, but the difference in a few grains to the mass of the lead slug seems to reduce penetration noticeably. Add to that the larger frontal area of the expanded slug, and penetration COULD be drastically reduced.
And the rounds are designed to expand and penetrate to the FBI minimums. Not to "expend energy" which is a moot point IMO. Muzzle energy tells me nothing. Also, hollopoints are not designed to not exit the target. That's the design of frangible rounds.
In the case that the hollowpoint becomes clogs, doesn't it, in effect, become a solid, flat-point bullet and would then have the same penetration characteristics of a hard lead bullet of the same weight?
Don't we expect the round to work as designed? Is it not designed to expand? If it becomes a solid, then no it will not work as well as a lead slug of proper alloy. It would work as well as FMJ.