Nice shooting FOUR4D4.

Not trying to be a smarty pants. As stated before, I'm not an expert. I surely don't mean to offend. I was just trying to be helpful.
My experience with the 44 mag. was less than satisfactory, granted, the 265 gr. bullet (although listed) is a bit heavy.
Looks like your 444 shoots pretty straight. I'm thinking, if you're happy, that's all that counts.
Quote from Hornady.
"Now handloaders can load the same 265 grain FTX™ bullets that are used in
factory LEVERevolution® ammunition. We found in our testing that the 265 grain
FTX™ bullets worked very well with H 4198.
This bullet can only be fired from 1-20" Twist rifles, approximately"
Here is the link. The quote comes from the text on the right side of the page.
http://www.hornady.com/assets/files/ftx_load_data/444_marlin_ftx.pdf
I'll attach an example of the .430 dia. FTX from my CVA, The range was 50 yards with Iron Sights. The Black Circle is 6". Although it's not bad, it would not be acceptable at 100 yards. I was hoping for a better group. Maybe I expect too much.
Grey
And, if you could use the 265 FTX that I have left, I'll send them to you, at no cost. Of no use to me except to use as a gift.

Some of them were loaded in my 44 mag. and then pulled. Should work fine for practice.