I think that Warnes are approximately the same height as the hunker mounts. I’m not sure that Warne even makes lows for the 527. I have a 527 with a Leupold 3.5-10x40 in Warne mediums. Bolt handle clears the ocular by 2-3mm on the bottom, but not too tight on the bolt handle (side). Plenty of room upfront on the objective - could maybe even go up to 50mm. This is a newer rifle with the reshaped bolt handle. Limiting factor still seems to be bolt handle clearance, but mine is comfortable. I don’t know how to post pics here, if you pm me, I’d be happy to email or text pictures
I know nothing about the 550s, but I’d recommend that you research Warne. They are nice.
