Re: accuracy international magazine issue?
The question is in regard to the magazine, so possibly not an AI rifle.
What's the rifle brand? Custom rifle, factory rifle, etc?
The earlier AI 338 mags were pre CIP length, shorter than the current version. If you're shooting a Remington 700 then it could have some freebore and it's unlikely you can load to the lands no matter what mag you use. If it's a custom rifle, then you need to talk to your gunsmith.
If this is simply factory ammo not fitting in the mags, then you have the old style mags and will need to find ammo that was loaded for that length of mag.