The 450 and the 45-70 are complete equal rounds to the hand loader. The 45-70 to the non-hand loader is clearly the way to go. Much more ammo selection including ammo that brings the 45-70 up to 450 marlin specs.They are indenticale with ammo from buffalo bore.
The 444 although a great round, it is not on par with the 45-70/450 Marlin. Here's way:
1. Larger diameter bullet: The 444 is a .429 caliber the 45/70 is a 457 caliber.
2. Bullet Weights: the 444 will top off at around 335grains. The 45/70 will top off around 510 grains
3. Flater trajectory: Using equal bullet type & weight, the 45-70 will have a flater trajectory then the 444
Trajectory Comparison: I used a 300 grain bullet loaded to max pressures for the 444 and 45-70 with a 100 yard zero.
Drop@ 150 Drop@ 200 Drop @ 250
45-70 -2 -8 -18
444 -3 -10 -21
What I have not done is compare the new Leverevolution bullets from Hornady here. Since Hornady loads the 45-70 to such anemic pressure levels, theres no way to compare the capability the cartridge really has. They do load up the 444 fairly well and hes it has a much better trajectory then above. However, but they are using a 265 grain bullet to begin with. At 200 yards the drop is about -2 inches. Not bad..... But my guess is that if you loaded up the 45-70 to its capability, it will out perform the 444 with these bullets as well in every categoty. If I use the 450 Marlin Leverevolution ammo from Hornady as a guide, using a 325 grain bullet, the drop is around -5 @ 200 yards. But again, this is a 325 grain bullet from the 45-70 versus a 265 grain bullet in the 444... not really apples to apples.
These are all great roounds, but the 45-70 has a clear edge over the 444 as a better and bigger game killer. Not to mention better ammo choices over the 450Marlin with equal performance to the 450 (they are the same cartridge). If you do not hand load, the 450 marlin has a huge down side in ammo selection and price... Not to mention, all the 450 loads off the shelf are loaded up to near max pressures. While this may sound good, its not always good depending on your hunting situation and or tollerance for recoil. If someone is trying to decide which one to go with, the 45-70 should be your choice. If you simply love guns,,,,, that may be a differant selection criteria all together.