I sent an email to Steve Pauwels at Boulevard Brewing to and asked about the priming formulas for the Wheat Wine. He sent back a very detailed reply. In sumary, for 3 vols CO2 - 1.67.5 ml (5.66 oz) of Muscat concentrate (68 brix) for a 5 gal batch.
Thanks for your question about priming with Muscat concentrate.
We also use Muscat concentrate to bottle condition our wheat wine and find that the Muscat juice adds some flavor to the beer. It is only dosed in small amounts so you can’t expect a lot from it.
As for calculation:
68 Brix = 68 grams sucrose per 100 gram
Flat beer has about 1 volume CO2 – addition of 2 volume to get to 3 volumes
In metric: 10 g/l sucrose -> 5 g/l CO2
Increase 2 volumes = increase ca. 4 g/l = addition of 8 g/l sucrose.
Density of concentrate is 11.13 lbs/gall or 1.33 kg/l
To add 8 grams/l you need to add 1,000 ml x 8 grams/1,330 grams = 6 ml
6 ml (100% sucrose) = 8.85 ml (68 Brix) per liter
For 5 gall -> 8.85 ml x 3.785 l/gall x 5 = 167.5 ml of Muscat juice
I hope this helps. Good luck.