I have a 527 in .17 hornet. They changed the bolt handle sometime in 2013. The target mine was shipped with is dated July 2013, and the rifle has the new bolt. I picked up a set of Leupold medium height rings. The scope I'm using is a Leupold FXIII 12x40 and the handle clears the scope - no problems. My SN - B29xxxx.