Good to know.
Zero makes the only .431" diameter .44 jacketed bullet I know of for use in the many revolvers out there with larger than standard chamber throats.
Also useful in the microgroove rifles.
Very accurate in a 44 mag carbine equivalent I make for 444 Marlin plinking, fouling shots, and setting up the chronograph.
24 grains of 2400, then fill the case to within .25" of the top with granulated plastic shotgun buffer so as to form a compressed load.
I use 13.5 grains of Grex but I think that's out of print now.
The Ballistic Products stuff would work fine.
BPI Original Design Buffer (500cc)-ballisticproducts.com
I would not reduce this load further (1735 fps).
Another, stiffer but still reduced, 444 round I like is this bullet with 31 (1958 fps) to 35 (2164 fps) grains of IMR4227, no filler.
I would not hunt with these as the bullet may fall apart upon impact but it's a great way to cheaply introduce folks to the big Marlin and work up to full power gradually.
The 444S has a lousy design stock making full power recoil somewhat brutal for the uninitiated.
Full 444 power with a 240 jacketed is around 45 grains IMR4198 for 2300 fps.