It' s no so much that it' s really weaker, it' s just thinner, making it weaker, there' s not some design flaw in it or anything, it was just designed at a time that modern pressure standards were unobtainable, it didn' t need to be that thick. The only reason that the .45colt has to STAY weaker than the .44mag is because of this, it' s too thin to handle the pressure necessary to push it past the mag, and if enough wall thickness were added to make it strong enough to handle it, so much case capacity would be lost that you couldn' t fit enough powder in it to get it that high anyway.