Here is a pic of the Magazine out of the gun. Overall length is 2.88 now. It would be easy to mill the spacer to 3.15 overall length.
I have 3 molds in mind ,360-294-RN,
360-280-SP and 360-310-FN. These should work well within the 3.15 OAL. I would like to have the molds in hand and decide on exact length to have the throat cut.
I think the 1/11 twist would work for these bullets from 1000 to 1700 fps