Question about the Ferdinand/Elefant Barrel

Hello everyone,

I Have just come to learn that the Elefant barrel has a certain taper to it. It starts off as cylindrical and then becomes conical.

Would anyone happen to know which aluminum barrel (Aber vs Voyager) represents this accurately? I have the Aber and Voyager aluminum barrels and they are different both in the taper and the length (by 1-2 mm).

Thanks in advance!