I do not believe so. The longer neck may help hold the bullet, but in my experience the significant recoil of both these cartridges (AHR and Jeffery) require a very good crimp. Both have adequate case volume with the AHR possessing ~ 8 to 10 more grains of water capacity.

I wouldn't call it a clone, it is an "improved" design of the original 500 Jeffery. Technically speaking the caliber is the same, but I believe you are actually asking if it is a "better" cartridge. As I stated earlier I think they are very close (too close actually). The Jeffery does have the "advantage" of fitting into a standard length action. The AHR version does require a magnum length mauser (or equivalent).

I would use either without hesitation, and actually I currently use the 500 AHR. Once you have driven a big 50 you won't go back.

Scott