Who can give me information about these 308
top one looks like an accelerator. Search web for 30 accelerator. also available in 30/30 Win. and 30-06
the upper look like had an AP core inserted in the sabot after removal of the SP .224 original bullet (if it the commercial round)
I don’t know the purpose of the FN experimental load, but it is described in the 7.62x51 book by Brandt et al. as a stabilized solid brass bullet with 4 fins that weighs 57,10 g (including sabot).
The one with the green die on the head looks like an American Ballistics Co. round.