223 bullet to use

1:9 twist is good for the 65 gr SPBT and 70 grn RN.
75 grns and over may not stabilize, but those are not hunting bullets (OTM, SMK, etc.).
 
My 1:9 twist Remington R15 has done well on deer with Both the Nosler 60 Grain partition and the 55 grain Barnes TSX.
 
I've seen people recommend the Hornady 60gr soft point as well, but no experience here. .223 is still not legal for deer in my state.
 
I would go with a mono like hornaday GMX, Barnes is great too but the same cost for half the bullets. Neither are cheap, but for hunting you shouldnt need more than one box. With your twist, I would assume best accuracy from the 50-50gr GMX, note that these bullets are lighter in terms of density, so they are larger/longer than standard 55gr bullets. Regardless, they impressive bullets with fantastic penetration and 95% retention and good expansion. Google some gel tests.
 
I've killed deer with 55r bullets. When using 223 for deer hunting, it is all about shot placement. I only take neck shots and they are always drt.
 
If it were me, I'd not worry about the bullet grains past trying to pick one that shoots with the 1:9 twist. In other words, the 55 through 70 grain is all good with the hunting bullets. Personally, my gun is a 1:8 twist and shoots the 55-60 grains awesome. And, they are Hornady soft points. It is a great little bullet. God Bless
 
I don't deer hunt with my 223, but I do shoot pigs and coyotes. And some of the pigs get rather large. So far, in my actual use, I've used 55 gr Nosler BT's on coyotes and they work great. On pigs, however, they didn't kill the pigs quite fast enough, causing me to blood trail through vines and thorns. So I went to different bullets. I can say that the 60 gr Nosler Partition, if not the best, is tied for best. The 65 grain Sierra Gameking seems as good and is very very accurate - more so than the Partition. I also bought a bunch of 64 gr Nosler Bonded Solid Base bullets, but have not had a chance to try them on pigs or coyotes. If you want great accuracy, I have to suggest the 65 gr Sierra GK. If you want penetration, I ran a 60 gr Partition through a pig the long way (starting just below the tail). Impressive.

None of those bullets will stabilize in my 220 Swift. The Partition and the Nosler BSB are marginal, depending on weather, but I gave up on them and went to the Sierra 55 gr Gameking. Haven't tried that one on pigs yet.
 
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