Michter's US*1 Barrel Strength Limited Release Rye2016 release. 108. 4 proof A Kentucky Straight Rye, Michter's Barrel Strength Rye is bottled at barrel strength rather than the 84. 8 proof alcohol level of Michter's US*1 Single Barrel Rye. The barrel entry proof for the product was 103 proof, a strength that Michter's believes yields a richer, smoother product than a higher entry proof would. After aging, the barrel proof for the majority of barrels of this second release bottled so far have fallen