So I went to bottle my mead today. Sanitized the bottles, bottling bucket, racking cane, etc. Had everything set up and ready to go. Before I transferred the mead to the bottling bucket, I tested out one of the corks (LD Carlson premium quality, #9 x 1-3/4) in the Renana 375ml bottle. Cork goes in nicely, but is a real sonuvabitch to remove.
Glad I didn't just blindly trust the word of the clerk at the LHBS. Had I done so, I would have filled my 40+ bottles and every single one would have pissed me off when attempting to open. Narrowly avoided disaster today.
I'll head back to the LHBS and buy the #8 size corks tomorrow and try again.