CFR›Title 27›Chapter I›Part 30›Subpart F ContainsSections 30.71–30.72CorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 Subpart F—Optional Gauging Procedures Sections 30.71 § 30.71 Optional method for determination of proof for spirits containing solids of 400 milligrams or less per 100 milliliters. 30.72 § 30.72 Recording obscuration by proprietors using the optional method for determination of proof. Previous E Subpart E—Prescribed Tables