NO I feel the case should have enough capacity to meet the needs I have in mind for this round and I want all the wall thickness I can get for head spacing of the mouth. the 44??? is over 1/2" longer than a 44 mag with a larger case OD at the base. IT should be plenty. My goal is 1800to1900 FPS this is only a rough guess but is based on what other simular rounds do. I am expecting a case capicty of aproximently 53-55 GR,s. this should make it a very capiable deer hunting round my intended purpose, and knock down what ever doors and walls and water jugs and dirt clods the Rambo guys think they need.Are you going to ream the inside to get more powder capacity?
I have a very nice tig welder so if I want to use aluminumit will be ok. I also have about 10 of the steel mags that tapco had so cheap back when.Also, I used steel mags and was able to spot weld the locking lugs. Not sure if aluminum brazing would work for the alloy mags. Something to think about.
As far as the mags go check this out here is the 44???? in a FAL mag. If cut down they would be almost perfict. (see next post for pics)
As far as brass goes here is some that will require no fire forming or expanding. little pricey but If you wanted to skip ma few steps it would be ideal it nalso has more case capicty due to thinner walls. it is 30-06 or whelin basic.
30-06 Cylinder Brass for Wildcat and Custom Ammunition