No. In a free market, there's no limit to how much leverage ratio a bank can use.
In a truly free market, there should be NO government regulation of banking at all.
"leverage" here is just code word for fractional lending (and other similar practices).
In other words, you seem to be saying that in a "truly free market", the goldsmiths should be able to lend out "gold-backed" notes and back it with as small a fractional equivalent as they please
with no government to oversee them. The libertarian line being that their so-called counterparties can hire 'private' auditors to make sure they don't abuse this concept too much.
The difference I suppose is that in the mythical days of yore [as presented by your friendly neighborhood conspiracy theorist], people
did not realize that their gold was being lent out with only fractional reserves to back it up. Nowadays, people are [supposed to be] smarter and are expected to demand more transparency, so the reasoning goes that they will not patronize a "private money provider" whose practices they do not find satisfactory.
Of course there is nothing really new to this story or scenario. Such "free banking" would be presumably more or less how the US operated before the Fed was created. There seems to have been a sufficient number of bank runs, failures and instances of outright fraudulent banking practices back then such that
the clamour for the creation of the Fed as regulatory body and insurance provider succeeded (revisionist history notwithstanding).
My own subjective feeling is that the US economic system is indeed being burdened and restrained by far too many regulations introduced by disingenuous politicians with a statist/socialist (I admit to being brainwashed enough to consider these bad words) agenda... and thus the swing of the pendulum towards a more libertarian mindset is largely justified.
But on the other hand, while all this talk about moving to private money and a more laissez faire system is interesting, people should really brush up on their history and not just swallow the most recent
conspiracy fad. I have noticed that the latter tends to be bolstered by one-sided and sometimes (often?) dubious historical facts.