How many different .338 lapua performane improved Cartridges

[clemens]

was wondering how many different kinds of .338 Lapua or .338 improved cartridges there are in the Lapua class. I know Kirby makes the .338ax that is a improved version and is there any benefit to one over the other? Application of these rounds would be long range shooting and hunting.

 

[C.O. Shooter]

Maybe some of this will help:

http://www.longrangehunting.com/for...pua-improved-338-lapua-ackley-improved-81321/

http://www.longrangehunting.com/forums/f19/338-rifles-76208/