Shooting 90s out of a 1:8 twist barrel wouldn't be optimal. I prefer the 80 grainers as you can get a little more velocity, and helps make up the difference in BC.
On edit: The factory Tikka 223 mag will allow for a 2.26 OAL. My modified mags will take just under 2.49 OAL. I can't remember how deep the throat is on it but I ran the 75 Amax at 2.39
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