Roger, what did the original look like???
Steve
I'm guessing this was directed at me.
The original design was of course the Ideal #429421 which was designed by Elmer Keith and later became the Lyman #429421. At some point, some brilliant soul at Lyman changed the design of the mould. The original featured a deep, square bottomed lube groove that would hold a good supply of lube and a deep crimp groove with a long sloping lead in for a secure crimp. For whatever reason, these were changed to a shallow, round bottom lube groove and a shallow square profile crimp groove. No less than Uncle Elmer himself raised a major ruckus over these changes. Lyman changed the design again, but it wasn't quite the same as the original.
RCBS had a 245 grain SWC mould that was highly regarded, but decided to go back to the drawing board and make a mould that was closer to Elmer's original design. The 44-250-K was the result. Many highly regarded shooters who have firsthand experience with the original Ideal moulds have declared the RCBS a very, very close match to it. I have no experience with the originals, but I can tell you that the 44-250-K shot exceptionally well in several .44 caliber guns I have tried it in.