I have set-ups of 200,250,300 & 400' of 45# copper. The Church boards pull them just fine. As mentioned, I double wrap the 50# PP on the release. I wouldn't bother with the 30# copper, as the sink rate doesn't differ much from lead core. JMO
300' of 45# copper would be a good choice for the CV55. It's important to have a large eyelet on the tip of your rod that you're using for copper.
Your fishing buddies will thank you for the change over to copper.