What caliber you using this year?

[BR549]

I'm still fascinated with AR15 / .223 / 55gr Vmax for the rifle.
What will be new is the match grade 9mm w/ target sights and properly vetted ammo for the close up, decoy attack shots. Should satisfy my pistol hunting tendencies quite well.

 

[284bloodhound]

Should I expect any issues pushing a 58gr vmax out of my 18" 1:7.5 twist 6arc? Is the twist a little too much?