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You’re probably in the right ballpark. However…
“Middle-weight” is pretty subjective, since what someone views as light or heavy depends upon what a person does with their .44 caliber cartridge.
.44 revolver guys, for example, often consider 240s to be the middle ground (or even HEAVY, for some shooters).
Yet, .44 Mag carbine shooters seem to like to edge more toward a 265 or 270 being the middle ground.
And, if you keep going, you get into .444 Marlin territory. There, you’ll find guys shooting everything from 160 gr bullets to 490 gr bullets. …And they all have their own view of “middle-weight”. Most guys would say 265 is a good compromise. But other people think 240 gr is plenty heavy, making a 200 or 220 their “middle weight”. While the ‘heavy’ guys think something between 375 gr and 415 gr is a “middle weight” bullet.
I shoot all of the above (from 180 gr to 437 gr, in .44 Special to .444 Marlin).
For me, a ‘middle weight’ is probably 265-275 gr.
As for the design…
You have to decide what it will be suitable for, before committing to a nose design. .44 carbine and .444 Marlin lever action shooters often have strict COAL limitations, and .444 Marlin has an exceptionally short throat (with just 0.045″ freebore). So most bullets suitable for .44 Russian, .44 Special, and .44 Mag don’t necessarily play well, if at all, with the rifles.
To play well with .44 caliber rifles, you typically have to have a short nose (0.300″ or less) and 0.360″ or smaller meplat, like the nose of the Ranch Dog 432-265-RF. And the larger the meplat, the shorter the nose has to be to feed reliably. (The RD 432-265-RF is a fantastic bullet with a great track record in a variety of .44 caliber revolvers and rifles – due in no small part to the fact that it was designed specifically to overcome the crappy chamber design of .444 Marlin, which gives it a nose that resists conical shearing upon impact.)
The closest .44 caliber bullets to the 411-251 that I know of NOE producing are the 432-290-FN and the 434-290-FN (essentially identical, other than diameter). However, their noses are too long for .444 Marlin in a lever action and some .44 Mag carbines.
If you were to offset the .411″ cherry to cut an oversized cavity for .432″, a quick ‘back-of-a-napkin’ calculation says you’d be in the ballpark of 279 gr.
Given the fact that Al probably doesn’t want to risk a crash, and that the bullet is a bit heavy, it’s probably best to start from scratch.