In the 38 special if there is a better load than 2.7 or 2.8 grains of Bullseye with any wadcutter from 140 to 160 grains , I haven't found it in the last 50 years of looking.
I did discover that the discontinued Lyman mould #358432 in the 160 grain weight,(it also came in a 140 grain weight) , shoots a bit more accurately than the 148 grain flush seated wadcutters I cast .
NOE makes this design as NOE-360-160-WC PB (360432). This bullet over 2.8 grains of Bullseye. 15 shoots go into one ragged hole 1 1/4 inches across ...it's spooky how well this combination works.
NOE recently made this same design in a 41 magnum bullet . NOE 413-215-WC-PB , it's just a larger version of the 38 cal. I jumped on a 3 cavity mould. I have cast some and loaded some with every powder I have appropriate for target loads....but haven't made it to the range yet. Some Hurricanes got in the way and then I got sick but on my next free Saturday I'm going target shooting with the model 58 in my avatar. This bullet should be a winner.
No help with 44 magnum , the 41 takes care of my big bore magnum needs.
Gary