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Okay so I just macerated some blueberry brandy preparing to make some bb panty dropper. 4 Quart jars of blueberries topped off with 130 proof brandy. I wanted to know how much the blueberries changed the proof In case I didnt use all of it for making the PD. After my initial shock with the hydrometer showing 15% I understand that it is no longer accurate. Im just looking for a way to estimate the proof know that ive soaked blueberries. Several posts said to use volumes but I dont know the actual liquid volume of the blueberries. I know this has been talked about before im sorry for the newbie question im just having understanding from what ive read so far. Would really appreciate a point in the right direction or a link to a good explanation.

Measure weight or volume and temperature at each step, including before and after long time steps like maceration. Remember that each measurement and calculation adds to the uncertainty and get as close as you can. Or finish, dilute till it pleases you and try to reproduce the recipe.

If you knew the volume and ABV of the spirit and the total volume now deduct the volume of spirit and whulah you got the volume of your maceration berries . there is a good phone app on the net called the distillers toolbox and it is pretty good for working out poof amongst other things