223 is a 1:12 twist (actually it's metric so the equivalent) the 60 Nos Partition was designed and developed to stabiliae out of a 1:12. I've have very good luck with a max load of Benchmark and 60 gr Nos Parts.
I have shot eactly one deer with it - I though it would be the cat's meow and bee's knees but it was not - not for me.
small buck, shoulder hit (low, angled towards the heart) I watched him through the scope run off, maybe 25 yds, No blood trail, just a small tuft of hair where I hit him.
When I got my SAKO, I called Nosler and asked about a 60 grain bullet and twist rate, told the tech what I was thinking (Bench mark and 60 gr Nos) he said "There you go...."
They won't stabilize vrey well out of a 222 because that's a 1:14 twist.
