A contemporary thread about an upcoming social gathering mentioned that the participants normally try very small pours, a necessity if one is to remain reasonable sober while sampling many bourbons.
That reminds me that sometimes my perception of a bourbon seems to change dramatically in the course of a normal, say 50 ml., pour. The first sip arrives and greets fresh taste buds and olfactory sensors. A certain impression is made.
With repeated sips, sometimes a hint of roughness seems to build, perhaps to the point where an initial favorable impression begins to dim.
OTOH, sometimes the opposite happens. Later sips reveal pleasant flavors that went unnoticed in the company of the initial surge of alcohol.
What size pour do you feel allows you to form a reasonably complete impression of a given bourbon when served neat?