My 527 has an American vs. Bavarian style stock, so comb is a bit different.
The lowest possible mount, in my experience, is the DIP rail and low (.9") Weavers. With this combo, you gotta have the newest, low bolt handle, which can be swapped out.
https://www.diproductsinc.com/Detail.aspx?PROD=1133585 This is an older 3-9x40 Leupold and it works great. The rail allows the forward rings to not be so close per the very short action. I generally don't like rails, but this one works for me and I tried several combos.
BTW, this one is a .22 K-Hornet, I opened it up with a rented reamer. Prestige model has extra nice wood.
DF