Re: 260AI questions
Kevin,
I think your OAL concerns can be handled with a properly spec'd chamber. A leade length that is adjusted to your VLDs can be setup to handle that bullet at standard magazine OAL very well.
I think your larger concern may be getting the AI to run out of the factory M700 feed rails. My experience has been that the shorter Ackleys can be moody about cycling out of magazines that are side feed only. Factory 700 action feed rails fall into this category. A center feed setup like the AICS magazines were the best performers for us in all situations that included dirt, grass, bugs and heat.
Let us know which way you go and how it performs for you.
Good luck with the project,
Terry