Regardless of what bullet you use in .223 the possibility of a blood trail is very random, but less likely with the 77TMK. There is no .223 bullet that Ive used (most of the bullets mentioned in this thread and more) that will reliably leave a good blood trail. Ive shot 56 deer this year and only a few would have been trackable through a blood trail. If the bullet is too hard you get a small exit and no blood, and if too soft no exit and no blood. The best for blood (but not necessarily killing) have been mid weight lead tip like 62grn Norma (very similar to 62 grn Sierra Game King) and 60 grn Hammers (driven very fast).