As far availability and price go, the top end Weller whiskeys are following the same path as American icons like Van Winkle and Michters. Produced by the Sazerac Company, ‘Full Proof’ is a new addition to the range as of 2019. The mashbill isn’t disclosed, other than being a Buffalo Trace “Wheated” formula – i.e. – corn, wheat and malted barley. One bottle available. 57% Alc./Vol.