I did a little 600 animal test with the 30-06 awhile back, with Hornady Interlocks, Woodleigh and Barnes TSX being the main culprits. There were some blue box Federal and factory Norma in there too. There was no doubt that the TSX had a firm grip on last place. My spotters learned to hate them.
Accuracy or pass through issues?
600 animals? Culling? Do tell.
I am not all worked up about the 'risk' of lead bullets, the cost of some of the fancier stuff has put me off them from the outset, but the tales of pass-throughs from the Barnes copper bullets really don't motivate me to bother with them.
I see them as the solution to a problem that didn't exist until folks that should have known better started to believe the propaganda from the hand-wringers.
But that may just be me!