Howdy
Can't help you with the current reproductions, but the Winchester Model 1892 rifle at the top of this photo was made in 1894 and the 1892 Carbine at the bottom was made around 1916. Both are chambered for 44-40. I have shot probably a few thousand 44-40 rounds through these rifles and several other 44-40 lever guns in CAS.
The original 19th Century rifling groove diameter of 44-40 was .427. Yes, some modern manufacturers are using the same .429 barrels that they use for 44 Magnum/44 Special. Most current Uberti rifles come with .429 barrels. These Winchesters have the original .427 groove diameter. I have slugged all my 44-40 rifles, and some have .427 barrels and some have .429 barrels. Because of this I have settled on .428 for all my 44-40 loading. Since I use dead soft pure lead bullets with my Black Powder loads, I expect the .428 bullets are bumping up in diameter in the .429 barrels and fill up the rifling grooves. In any case, they shoot very accurately.
Horsefeathers!!!
I seldom crumple a 44-40 case anymore. There are a couple of tricks that I have learned over time. First off, if you need to use 'fat' bullets, such as .429 or .430 diameter, you stand more of a chance of crumpling the thin neck. If you are using slightly smaller bullets, on the order of .427 or .428 there will be less friction as the bullet slides down the neck and less reason for the case mouth to crumple. One trick is to use the case belling insert from a 44 Magnum/44 Special die set. Since 44 Mag/44 Sp die sets are designed for .429 or .430 bullets, the belling insert will be a couple of thousandths larger in diameter, swelling the case mouth slightly more, reducing the friction as the bullet slides in and reducing the tendency to crumple the neck.
Here is a photo of a 44-40 with a crumpled neck. Notice the crumple is down below the bottom of the bullet.
What tends to happen is that as the case rises up in the seating/belling die, 'swallowing' the bullet as it goes, if the case mouth comes to a hard stop against the crimp groove in the bullet before the case stops moving up, the brass has nowhere to go and winds up being shoved down below the bullet. A crumple like this is often the result. If the same thing happened with a more robust case like 45 Colt, the brass would simply dig into the bullet and no crumple would happen. But the brass is so thin at the case mouth with 44-40, usually on the order of about .007 thick, that it cannot bite into the bullet. Instead it yields and bulges down below the bullet.
The solution is very simple. Set up your die so that a hairline of space remains between the bottom of the crimp groove and the top of the case.
Like this:
The crimp will form but will not butt up against the body of the bullet, and there will be no bulge.
By the way, I have never trimmed a piece of 'pistol caliber' brass. It does not stretch enough to need trimming. So to set up my dies for seating/crimping 44-40 I measured a bunch of cases and selected the longest ones to set up the dies. Shorter cases will just have slightly more space under the crimp groove. All you need is a few thousandths.
Haven't crumpled a 44-40 case in years.