I load mine with the same loading I have used in my Marlins for years and years it shoots just fine. A couple years ago when the FTX first became available I bought a box of the 160g made for the 30-30. I loaded them up with the same load I used for the 170g and it shot even better then the 170 did!
I have shot one deer with them and the bullet came apart and never exited the animal. I got the deer, she went about 50-60 yards and piled up in mid bounce right in a big pricker bush! I like the way it shoots, but not so much on its performance...
Anyhow, my loading is WW748 powder and a 170 Hornady RN. My powder charge is actually more than listed maximum, but has been used for over 30 years and proves safe in my guns. Check your manuals, its in there!
As for the 44, I prefer big heavy bullets and you would do well with Speers 270 GD and a charge of H110 or 296 powder.
Good luck,
CW