Thanks for the answers,I allready have a BRNO ZKK 601 in 308 WIN. in perfect condition. I was thinking of having build a TAKE DOWN with interchangeable barrels,and have the following components: complete barrel in cal 308 from another ZKK 601, and a complete rifle CZ 550 MEDIUM in 9.3x62, so the idea is rechamber the 308 to 30-06 add the forearm and locking latch for the take down mechanism, and the same with the 9.3x62 barrel, converting it to take down with forearm an latch, so I end up with one action and two barrels one in 30-06 and one in 9.3x62, with one action lenght (CZ 550 MEDIUM).
This would allow me to practice with one action lenght and same safety lever operation, since BRNOS safety levers work forward for safe and the CZ 550 works rearward fore safe, and bolt travel also is different from one action to another (short BRNO601, medium CZ550).
I am sorry but evidently I wasnt clear with what I wanted to do in my first post, I some times have difficulties with my english.

Best regards.

Ernesto.