Ok, we've got a few things here: I've found C300 footage to be super annoying to work with. For one thing, that camera does "clip spanning" which means while filming, once the file reaches ~4GB in size, it starts a new file. So for a 30 minute clip, you might have 6-7 MXF files, even though this is only "one take" or "one clip." When you are project managing, say you pick 20 minutes of that 30 minute clip. Depending on where your in and our markers are, Premiere may pull ALL the clips because all the separate MXFs contain data from within your chosen timecode. This may also depend on how you brought your footage in. If you did it via the Media Browser, Premiere may consider it one clip and no matter where within the spanned clips your footage lies, it might bring over everything. If you brought your MXF files in individually and placed them together yourself on the sequence, Premiere might actually separate them correctly when you Media Manage. Finally, take a look at my thread here: Project Manager - Consolidate and Transcode problems I detail some issues specific to the Project Manager that will break some functionality without giving you and sort of error or message, though this pertains mainly to using Consolidate and Transcode, not the "Copy files to new destination" function. I admit I have not used that as much as Consolidate.
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