I might be seeing things differently, but the jacket on the 120 gr. bullet looks thicker all the way through until you are almost to the base. At half way down the jacket, there can be no doubt.
That "penciling through" may indicate not much expansion, but it did kill. Food for thought. Many don't like the Barnes X because of it's smaller expanded cross section. But, work they do. I much prefer a bullet that shoots through to one that looses it's core and doesn't exit.
Besides, we have the new poly tipped bonded bullets like the Scirocco, and the Interbond if faster/more expansion is desired. E