One of the problems I run into when thinking about guns, is even with the internet there is still not much information available. Sure there is a lot of text, but most of it is the same information over and over. When I try to find twist rates, bore diameters, groove depth and width, and chamber dimensions, or the information I need for bullet measurements, it is hard to come by or non-existent.
The common belief among "you-tube experts" seems to be Micro-groove =bad, Ballard=good. I can not find the information I need to form an opinion. What I suspect is: in a fire-lapped barrel or one with no tight spots to begin with, I would get more bullet grip with 12 Micro-groves than 6 Ballard grooves. In my feeble mind, it was not the Micro-groove rifling causing the problem, but the twist rate. Marlin engineers say no, but they gave all the other calibers 1/16 to 1/20 twist rates and the 44 and 444 a 1/38. When the bullet weights and bullet size match the barrel and twist rate the guns shoot. The .357 with its 1/16 twist rate Micro-groove barrels had a reputation from the start as shooting great. The .41 was never changed to a Ballard cut rifling. None of this matters today, except Remington had a chance to give us a new twist rate when they went to all new machinery, but they did not have the foresight to change the twist rate. Will the guns shoot any better with a faster twist rate. Like I stated before, engineers say no. But from a marketing standpoint it made since. I already have an 1894 Marlin in 44 magnum and I would have purchased a new one. There is no incentive to do it with the current status. A lot of people think the Ballard barrels shoot better in the 44 magnum rifles. I suspect the ones that do, do so because the groove diameters have shrunk in the new barrels. So people shooting commercial bullets come closer to having a projectile that fit the barrels.
Last I heard the bean counters had put Remington into bankruptcy so it may not make any difference in the future. It was a shame to do what they did to a fine company with a repeat customer base few companies enjoyed.