A few things you may not have known:

[Jim__]

16. Well, for instance, a shot of whiskey ...

From snopes

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Although the meme is of recent origin, Internet mentions of this alleged historical fact date to at least 2003. Significantly, however, we were unable to trace it back any further than that, nor could we find any credible support for the general claim that it was common to use ammunition as a substitute for hard currency in frontier drinking establishments.

Was the price of a single .45 six-gun cartridge equivalent to that of a shot of whiskey in the Old West, as claimed? It doesn’t appear so. The 1891 edition of Chicago hardware dealer Hibbard, Spencer, Bartlett & Co.’s General Catalog lists Smith & Wesson .45 cartridges at a price of $25 per thousand, or 2-1/2 cents per cartridge. For the price of a shot of whiskey, we consulted Kelly J. Dixon’s 2005 book Boomtown Saloons: Archaeology and History in Virginia City, which notes that the average cost of a measure of any drink was around two bits, or 25 cents (although the cost later dropped as competition increased when more Americans moved west). Using those figures as our base prices, one shot of whiskey would have cost the equivalent of 10 cartridges. Even allowing for price variations according to time and place, it appears highly doubtful a one-to-one correspondence between the price of a cartridge and the cost of a drink ever existed in the Old West.

But, it's still interesting to read.