Sorry I'm coming late to the party.
Yes! This is the same exact problem I had with 165 grain Hornady SP's. I made the mistake of trying to mix two boxes, one old and one new. Yikes!
The ogive is definitely different. I would go as far as to say radically so. My last box of the old bullets were probably purchased around 2008 or so. The box the new ones came from Grafs earlier this year. So far I have not seen a change in performance.
