.44 version of 358-156?

Now that is an interesting question.  I couldn’t find a 44 caliber with two crimp grooves in either the old Lyman catalog or from Hensley and Gibbs.  That pretty much covers the major makers since the advent of the .44 Magnum.  As to why such a critter doesn’t exist, my guess would be that .44 Special and .44 Magnum brass have always been available in roughly the same quantities at roughly the same price, so there was never an economic incentive to use Special cases in Magnum guns.  Contrast this to the .38/.357, where the market is still awash in Special cases and Magnums are relatively few and expensive.  Maybe one of the Keith scholars knows if Elmer ever experimented with 44 Specials loaded to a longer length.