Beer Liquor Equivalent

beer vs hard liquor on getting drunk?
Ok, so I have a question? I always listen to a bottle of beer is equivalent to 40 percent shooting 80 proof liquor. But if that is the case, then how come I get drunk or effected by liquor much faster. I'll drink like 6-7 beers and beer each one I like to take a couple of minutes to go, if I drink fast. With only get a buzz. But if I take as 6-8 shots of vodka as I was an absolute hit faster and stronger, and I will not be totally lost drunk, but drunk. What is this reasoning if one beer is equal to a shot?
In alcoholic drinks alcohol is more concentrated.
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