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So, if
To err is human
translates to
Errare humanum est
what would be a good translation for
To throw (a stone or projectile) is human
I'm looking at proicere humanum est and mittere humanum est; proicere parallels with 'projectile', and mittere parallels with 'missile'.
In particular, the context of this is more in the
drop a stone down a well to figure out how deep it goes
rather than
throw a rock at a bird for hunting
Interestingly both mittere and projicere are found in the Vulgate bible in the famous Joseph story where Joseph is thrown in a pit by his brethren (Gen 37). So on that authority alone I'd say both of your candidates would be sound choices.
However, it seems to me that demittere may be also appropriate: to send down; to drop; to let, sink, or bring down; to cause to hang or fall down; to lower, put down, let fall
Depending on context, it may be interpreted as "lower" (e.g. aliquem per funem in puteum demittere) or as "drop" (nummum in puteum demittere).
So, the way the construction works is a simple predicate nominative with sum, infinitives are considered neuter singular, ergo. Any word for throw you want will work with the same construction:
"X est humanum"
X being, iacere, proicere, abicere, contorquere, torquere etc.
