You remember incorrectly.
See Stephen Gandy, Bessa importer's website:
http://www.cameraquest.com/leica.htm
According to him the Bessa RF cameras are #11 of 19 on the list of rangefinder baseline lenghts, with 10 Leicas ahead of it.
I didn't make it up or measure it, just reporting what the importer says there:
"The entire idea of Rangefinders is accurate focus. The longer the RangeFinder Base and the larger the Image Magnification size, the longer the Effective Base Length.
RF x IM = EBL
The longer the EBL, the greater the Rangefinder and focus accuracy.
The longer and faster the lens, the more important EBL becomes for accurate focus. If you are having trouble getting consistent focus with the 75/1.4 or 50/1 on your M6, you might want to try a M3 (or the M6/M7/MP .85) for increased focusing accuracy."
According to Gandy the EBL of the Bessa cameras is: 25.16
And various Leica M EBL is: 49.32
Except M3 EBL which is: 62.33 which he calls the "most accurate"
Whether this will make a difference in
your shooting accuracy I can't say, but certainly if you plan to use a really fast lens f 1.2 or even a Noctilux, I suspect it might