I know when I make EdWort's apfelwein I consistently hit around 7.7% ABV. I usually use Tree Top apple juice. Last time I checked the SG of just the juice was 1.046. 1.046 will take you to 6% if you ferment down to 1.000. I remember one of my first batches I did 5 gallons of apple juice to 5 pounds of dextrose and it finished up around 11.5%. I'm sure the sugar content of the apples in the juice change a little bit, so I'm not sure if it'll always be the same SG, but that's about what I remember. So yea... about 4 pounds of sugar in a 5 gallon batch and you'll be around that 10% mark.
5 gal EdWort's Apfelwein
4 gal Strawberry Vanilla Melomel
1 gal Cyser
Vanilla Cider Wine, Spiced Cider Wine, Cider Wine, Summer Berry Cider, Caramel Double Apple Cider, Caramel Double Apple Cider (oaked), Skeeter Pee, Brandon O's Graff, MAOM, EdWort's Apfelwein