I realise that my measurements are not American - apologies.
my-ty, the blackberries are very anaemic and a bit squashed when they are removed from the Whiskey!! i have not tried tasting them though. The Whiskey tastes much nicer - to me - I don't like regular Whiskey. Any of these liqueurs can be just served over ice, topped up with Prosecco, or fizzy lemonade, or whatever you wish. I find the price of liqueurs to be very expensive, here anyway, so I like experimenting.
I also realise just now, that I am spelling Whiskey in the Irish way; Whiskey from Scotland is spelled Whisky!!