Ok since this is important I dug the bottles out of the trash. The entry to bottle 1 is a pencil hole of course so I am not showing that. This is the exit to bottle one
Entry bottle 2
Exit bottle 2
Entry bottle 3
Exit bottle 3
I had to double check my original pic to see that the bottles were all aligned with the cap on the right. The entry and exit on bottle 3 looks odd as though two holes, one for the jacket and one for the core possibly. The exit on bottle 3 is for the core which went thru bottle 4. I did not take a pic of it since the entry and exit are a small pencil hole. The entry hole in bottle 2 is almost large enough to stick my little finger in. It appears that the bullet was opening up significantly after passing thru the first bottle.
So, for SHTF ammo no, but as a backup possibly, as cheap 75gr practice ammo, you bet. What other cheap 75gr ammo is there out there?
But this is only bottles of water, someone needs to shoot a pig with this stuff and report back on that.