Hi Cromm, I am using both a boo-backed eucalyptus longbow at 35# and lately a Chekmate Longhorn at 45# (it is far smoother to shoot than the lighter bow). I use VA or POC shafts of correct spine, tapered at the tip 5 degrees for tapered glue-on field points. Shafts vary from 400 to 500 gn finished and I select carefully to use none with grain runout after I got splinters in my hand from a commercially purchased 'exploding' POC shaft first time I used it.
I am fed up with throwing away three or more out of every dozen shafts for either faulty grain or excessively light weight even if spined correctly. Just getting too expensive and even the so-called premium priced 'selected' shafts were poor value. In Australia here, when I posted about the faults on forums, I got told off because no-one else it seems has these problems! But I am not that bad at making arrows, just maybe too particular about selection. For example, I bought a dozen POC at 45 to 50# spine and the mass varied from 240 to 450! I also bought 24 VA shafts and half, seriously, half of them were so bent that even heat straightening doesn't work well. I don't want to say names because so many others support these guys and they do indeed work hard at supporting traditional archers.
I also had problems with the first longbow I bought from a local maker (I was green and excited), badly gouged finish, overweight, handle popping off, glue starved boo joints etc. and got flamed for stating that on forum! So I don't want to get a reputation for just being a whiner but I truly think standards are low. Another example, I just got fifty fletches and four of them are badly creased, one or two have a quill split. Maybe that is another thread to post but my money is very tight and I expect perfect or near perfect when I buy! The Longhorn is second-hand and was quite expensive for me to buy on my pension but it is brilliant to shoot so I would love to match some wood arrows for it.
I just don't think, although I can be grumpy at times, I am that bad at working shafts. Even taking into consideration my own mistakes and the learning curve for a beginner, too many get rejected by me and of them, too many still break.
It is quite possible that a couple of unhappy coincidences and my own lack of skill have added to the woes but I just want to find a good source of shaft wood so I can carry on happily making, tuning and experimenting with different fletches and arrows. I found that ordering shafts from USA means doubling the price including postage, well out of reach thus. So ...... bamboo?