
Navy strength gin is a juniper-forward gin bottled at a minimum of 57% ABV, well above standard gin proof.
Standard dry gin is the same drink at lower voltage, and the arithmetic is worth doing. To carry the same alcohol as 30 ml at 57% you need about 43 ml at 40, and those extra 13 ml have to come out of something else in the glass. Usually the honest move is to accept a softer drink instead. In a Navy-strength gimlet or a strong Martini the strength is the point, and nothing substitutes for it.
Standard dry gin
Around 40% against navy strength’s 57 minimum, with much the same botanical bill. The flavor survives the swap and the structure does not: at the same measure a Gimlet comes out thinner and waters out sooner.
Overproof gin that is not navy strength
Overproof has no legal definition — it only means stronger than standard — while 57% is the specific navy figure. A 46% bottle is neither, and a recipe written for 57 comes out lighter with it.
57% is the old threshold at which gunpowder wetted with the spirit would still light. The extra strength concentrates the juniper and the botanicals; the recipe stays the same.