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Yes.
1.355 in a 1.350 chamber would be very bad, very bad. :)
.050 back from the actual chamber length is a good rule of thumb from what I'm reading.
If your chamber is longer you get a bit of unsupported neck which can affect accuracy (not consistently indexed) but for an AR and the expected accuracy from it, I don't believe it outweighs the potential for high pressures that will develop when your casings grow (flow rates change with # of reloads even if you trim every time) and then have no place to go in the chamber that is too short, locking the bullet in and raising the pressure to unsafe levels.
The SSK 1.350 chamber is mostly because .221 Fireball brass does not resize past 1.355 well. Shorter chamber means you can cut the case shorter, not that the OAL will change much as the magazine is the limiting factor and bullet setback is not an issue with a low pressure round like the 300 Whisper.
Since I'll be using .223 brass the 1.400 makes more sense to me.
Now, all that is just my WAG. I've yet to read anyone that says one way or another and there does seem to be a lot of guess work on this Wildcat so I'll stick with a safer 1.400 since I like the extra wiggle room it gives me and don't think accuracy is going to suffer to a point I can see it in my AR15 SBR setup.
If any of the experienced guys read this, please point out my errors in thinking!
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