ORIGINAL: Big Ol Gobbler

I need some advise. I recently purchased a CVA Kodiak. A gentleman at the local sporting good store told me to purchase some round balls with which to shoot to help break the gun in. The CVA manual doesn't address "breaking the gun in". I understand the reasoning behind going through this process but is it necessary? I've purchased some 295 gr Power Belts and 250gr TC Shockwaves to try. If I shoot the Powerbelts first, would this accomplish the same task, obviously a bit more costly, that the round balls would? I'm heading out to the range this week to sight it in before the season here in WI. Thanks to all.