Didn't see it mentioned, so I'll add it to the thread.
Most of the published figures I've seen for the increase in case volume are 5 percent. Using Mule Deer's 50-percent rule, that should yield ~2.5 percent increase in velocity without increasing pressure. Or a little more than 60 fps over a 2500 fps non-AI velocity. Saw on another forum where someone ran Quickload on the two cases and came up with 60 fps increase with a 150-grain bullet.
So if you're serious about 150-200 fps, or even 200-300 fps that some claim, it can only be accomplished with significantly greater pressures. How much greater, you can start to guess at and maybe start to test with Quickload and a strain gauge system. Personally, I wouldn't do that to a pre-G2 Contender or a Marlin.
