Outdoor writer Brian Pearce did a big article on the .444 Marlin. He rated the 300gr XTP as a moose bullet. I’ve never tried them on game but they are very accurate in my .444.
Found the article.

Outdoor writer Brian Pearce did a big article on the .444 Marlin. He rated the 300gr XTP as a moose bullet. I’ve never tried them on game but they are very accurate in my .444.
You can shoot 2.5" .410 shotshells out of some 45-70 rifles, if that's of any use to you.
Found the article.
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There is no wrong answer here.
Just curious, what are the opinions of the CVA Scout II? Thinking of getting one in 444.
Have enjoyed using mine. Really wanted an encore, but those are mostly impossible to find, so settled on a CVA scout.
The fore stock is always sitting a bit loose, but she shoots, so that's all that matters. Currently loading up a 325 gr cast and pushing over 2000 fps and going to try a bit hotter. Was getting 1" groups at 100m with factory hornady 265 gr.
The only other one that might be worth considering is a ruger No 1, but those are triple the price, and almost as hard to find as the encore. Then you are stuck having to rechamber as I don't think they made it in 444.
No its for sure not 1-38.
I think 1-20 twist. Was reading that some say it doesn't like the heavier bullets, but I was testing a 300 gr nosler and the 325 gr cast, and was pushing them both over 2000 fps. My best groupings on both were 2 shots almost touching and the 3rd was off about 1-1.5". Will be honing in on those powder weights and some more testing and bullet seating depths tests going forward.
Should be easy to get a 3 shot group in the 1" or less range, and then some testing for hold over at 200m.
Using IMR 4198. Couldn't find any H when I needed it, and RL7 wasn't around were I was.
I do however still want to get some RL7, and will eventually.