According to the Sight 1911 web site, the original .45 ACP adopted by the government had a velocity of 830 feet-per-second. That's what I have always considered to be the benchmark.
http://sightm1911.com/Care/45acp.htm
According to the Basic Field Manual FM 23-35, the nominal velocity was 800 feet-per-second:
http://sightm1911.com/manual/Untitled-24.htm