I've kind of lost track of which bullets these were, but I'm fairly certain these are of the .308 variety, but the picture could be of any of the North Fork bonded cores that have been recovered from the various animals the Clayton family have taken using these bullets.
Bullet Type: North Fork Bonded Cores
Calibers / Weights / MV : 7x57/140gr / 2800fps, .308Win / 165gr / 2600fps, .30-06 / 165gr / 2800fps, .300WM / 200gr / 2800fps, 250gr / .375H&H / 2900fps
Weight Retention : 95% or higher
Largest animal with 7x57 was a Zebra on a frontal quartering shot. Bullet entered towards the inside portion of animals left shoulder passed over the top of the heart and came to rest under the skin behind animals right shoulder.
Largest animal with .308W was an Eland. First shot was broadside and would've been enough. Ethics however demanded followup and a number of finishing shots were taken by my son.
Largest/toughest animal with .30-06 was a Black Wildebeest. Shot was a bit far back, not well placed (damn action screw had backed out but that's another story). What I have found with the NF's on the less than well placed shots is they put enough of a hurt on the animal that a followup is possible. We've not yet lost an animal due to poor shot placement.
Largest animal with .300WM was a old blue Eland. First shot was angled from behind. Bullet entered towards back of ribs and came to rest under offside shoulder. This bull was dead but still running. There was a follow up shot into the hindquarters.
Largest animal with .375H&H was a blue wildebeest. One shot. Animal did run maybe 100 yards, but that's a BWB for you.
Animal List taken with these bullets: Black WB (2), Blesbok (2), Impala, Springbok (3), Zebra, Gemsbok, Blue WB (2), Eland (2), Nyala, Common Reedbuck (2)