Chris,
The fact that other ar bow cultures used different types of bow has very little bearing on the nub of the matter which is that if the task is to project a hevy projectile with penetrating force so as to defeat defensive armour, then if it has beenshown that the higher end draw weights are more effective at this task, then I'm quite happy to accept that these weights would have been in use where the level of defensive arms required it.
That the defensive arms were in some cases quite capable of resisting penetration with varying degrees of success should come as no surprise, why would defensive arms be developed if they could not ameliorate the situation.
To often in such arguments we have the opposing camps holding unsupportably entrenched views.
Such as, in extremis " all longbow shafts can penetrate any armour" and the obverse "all armour of any quality can resist warbow shaft".
Both of these positions are of course patent nonsense. Any sensible reading of the history can only lead to the conclusion that in this particular arms race there was ongoing development in both areas.
Too often tests are made which are flawed by not looking either at the defensive systems as just that, complete systems, or on the other hand at correct application of point profiles and hardness.
We have seen unhardened type 7's dropped onto plate supported by a hard surface, for example.
Virtually no work has been done on the role of padded garments as an integral part of the defensive system, and now to raise the hare of suggesting that no-one might have used draw weights in excess of 120lb is patently absurd.
I daresay that in the early days a heavy hunting bow or a war bow of 100lb might have been perfectly adequate against a byrnie.
In the 13th C a thick aketon over a hauberk could be very effective as a defense against a point that was insufficiently sharp, whereas in the 15th C a heavy bodkin with a limited point which might fail against an aketon would be capable of punching a hole in plate, given an apprpriate angle of strike and a ductility and thickness that could be defeated by such a point.
What most folks seem to ignore is that the primary task of plate was not to completely prevent penetration, but rather to increase the probability of deflection.
There has been far too much sloppy thinking and poorly carried through "research" on this topic.
To suggest that whole armies might be defensively armed so as to render archery ineffective flies in the face of recorded history just as does the assertion that archery could render everyone ineffective.
Your report of the butts in Devon is interesting, sounds more like a location more for social activity than for serious military practice. There are illustrations showing such small ranges, but more often of a later period and for civilian use of crossbows.
It certainly does not appear to be a range that might be used when laws were in place prescribing minimum distances for the practice of shooting in the bowe.
Rod.