I was in the same dilemma as you. Wanted a rangefinder to hit at least to 1800 yards. Bought the Kestrel 4DOF and then ordered the Leica. The ability to link the rangefinder to the Kestrel is great. 2 vendors here who can give you a good price if you call them.
Go into Kestrel link app.
Select gun profile management.
Select gun in profile.
Scroll down and you will see Axial Form Factor. Input AFF.
Then link to Kestrel. Profile should be updated on Kestrel.
I have a new SP 10 also. 20 rounds down the tube and I am very happy. 12 year old son was hitting 8" gong at 300 yards after initial sight in. He is a happy camper. Looking for a sling and bipod for it now.