Cornelis,
I looked up Atomiks website and this is what I found:
Penn 340 GTi 300' 45# copper/backing/leader
Will reach 60' to 65' of depth
Penn's GTi series ready rigged with copper/backing and fluorocarbon leader 300 yds 50# Power Pro backing on each set-up A-TOM-MIK .037 45# copper sections 200', 300', 400', 500' & 600' 50' Ande Fluorocarbon leader 30# test per each Albright knot used for connections to backer and leader
Also, Andy is right off the bat about inserting mono between power pro and copper. This will allow you to set up release on the mono from your board.
Best of luck,
Anthony