The Spurlock Museum states that a 7.5 foot Yagua blowgun in their collection (they don't state the caliber) "may be able to shoot as far as approximately 325 feet", putting the range past the 100 yard mark. Of course, later in the same sentence, the museum states "at a velocity of 425 feet per second. This is 289 miles per hour, more than twice the speed of the fastest baseball pitcher." So even if the range claim is accepted, I believe there will be some eyebrows raised over the velocity claim (to put it mildly, hee...).
One of these days I'm going to get around to contacting someone at the museum and asking if they can provide with the formula, test (or other means) by which they arrived at their figures.
Here's another authority (?) on the subject of blowgun range/velocity: "The dart flies faster than the eye can track (200-350 f.p.s.), so a
stealthy blowgunner can wreak some real damage. Darts will penetrate a
1/4" plywood board with ease and a 1" pine plank if the shooter has the
lungs for it." This time I am quoting Tom Gaylord, an airgun writer who publishes a daily column. The quoted 1/4" figure for penetration on quarter-inch plywood is something many blowgunners have probably witnessed or accomplished, so no eyebrow-raising there, I think. As for the pine penetration... I've heard independent reports of penetration on 1/2" pine plank being achieved with heavy "coat hanger darts". Has anybody here punched a dart through an inch of pine? It doesn't sound impossible to me, with the right sort of dart (heavy, slender, sharp, and stiff), a long barrel, and good lungs/technique. But it doesn't sound easy, either...
Moving on to Gaylord's velocity figures: here again we have velocity numbers quoted by an authority (?) on the subject which would tend to raise eyebrows around here. I don't really have a problem, myself, with the 200 fps end of the speed range which Gaylord "claims", although I know some blowgunners are skeptical of surpassing the "200 fps barrier". But I think even I would be shocked (although pleasantly shocked) if I witnessed someone using their lungs to launch a blowgun dart/pellet at 350 fps. Even 300 fps would kinda stun me. 250 fps would only mildly surprise me.
Now, I still haven't got to Gaylord's claim for blowgun maximum range, which is contained within the following quote: "There's a huge variety of blowguns available on the internet today.
There are big-bore guns, guns that will shoot 440 yards (almost as far
as a diabolo pellet!) and all sorts of dart types, plus paintballs." (the bold type was Gaylord's emphasis, the underlined part is my emphasis)
So there you have it: a claim of 440 yards range with a blowgun....
that should give us something to talk about for awhile.... hee hee....
Bonus points to anyone who writes/comments to ask Tom Gaylord if that was with a tail wind... heee...
I think it is possible, since he mentions the "huge variety" of types of blowguns, that Gaylord was referring to launching darts with a CO2 attachment for a blowgun, in which the shooter's lungs contribute NOTHING to propelling the dart. (Instead, the shooter's breath triggers a valve that releases a burst of CO2.) Even with a CO2 blowgun (if it can still really be called a blowgun) I'm not sure how easy it would be to reach 440 yards, unless you used fairly heavy darts.
By the way, none of this is intended to pooh-pooh the idea of somebody being able to achieve surprisingly long shots and extended ranges (with lung power alone) by dint of practice, natural ability, and/or specially designed blowgun and/or darts. In newspaper articles from the 1800s, I've seen at least one writer report that "indigenous" blowgunners could shoot and hit targets at about 80 yards. Was that just nineteenth century hype? Or is it actually a worthy challenge for us today?