Alan
I have to say I agree with you that using a heavier bow forces you to do it a different way and thats certainly been my experience.
I think that being built big, you probably do have some innate advantages - bigger joints to spread the load better and big people have more basic leg and lower back strength. Having said that, I suspect that any healthy male can get up to 100lb at 30ins with training these days.
My own experience was based on an old 60lb victorian bow, an ash bow I made and an italian yew bow which was originally 90lb at 30 ins - but is a little less now. I started off with constant discomfort - nothing bad, just a niggle really - in the mobile wad of my right forearm (thats barchioradialis, and extensor carpi radialis longus and brevis). When that settled - which it did in spite of continuing to train - I then got about 6 months worth of discomfort higher up the line in the Acromio-clavicular joint. Again, in spite of continuing to train, its now settling and I'm assuming its due to the soft parts of the joint moulding to accomodate a specific type of new activity. I'm 6ft tall in my socks and 167lb with a long reach and small joints - so I guess my destiny is not to use a 130lb bow - or at least not without considerably more effort than you discuss.
Have you had any similar experiences at all - or has anybody else? At the moment, things are moving slowly and steadily forward and I'm getting to grips with a big swiss yew bow of 100lb at 30 ins and making progress.
I'm pretty sure you'd have trouble using that bow of yours in the situation I'm suggesting. What I mean is marching 270 miles in 17 days with only one days rest. No shelter to speak of and rations consisting of a few nuts a day and some mouldy meat which makes you sick(or vegan equivalent - but it has to be poisonous yeah?) . On one day, you get a bellyful of half fermented wine and some bread which does more harm than good. It rains the whole time so you're always wet and you don't get much sleep. By the last few days, you have diarrhoea and/or bronchitis and are forced to fight bare arsed in order to have hope of a clean pair of trousers to go home in, if you survive. In fact, anybody trying that would have a fair chance of dying and would be doing well to stand unaided by the end of it, let alone use a 130lb bow.
There is another big problem with trying to extrapolate that abilities of one or a few people to those of thousands. When dealing with large numbers of people, you get ranges of abilities. The bigger the numbers, the bigger the range. Now, if you calculated the average strength of men in an army and made a bow based on that, then half the army would be unable to use the bow. What you need to do is calculate the percentage of people you want to be able to use the bow (I'd say 95% or roughly 2 standard deviations either side of the mean) and set the bow weight at the lowest end ie average strength minus the two standard deviations. As somebody said in a previous post - its about minimums. That way, you can engineer a situation where everybody can use the bow - and you'd need to take into account the effects of privation on campaign by the way.
C