Hey Smoke..... Very nice dig indeed! Congrats!!
Sledding hills are great, in fact, any hill that is in a traffic area such as parks, playgrounds, or along waterways(fishing,swimming etc.) demand extra attention with a detector. In your case, I would go back a few more times and cover that hill again, maybe with different settings. I worked a particular hill in Maine many times, as did several other "tectin' buds and we took out good load of coins, mostly mercs. It wasn't a big hill, but it was next to a river near an old hand made granite dam, (mill site). Local folks told us they used to gather there, "back when we were in school".
Welcome !! Good luck !............HH Looking forward to checking out more of your finds!