I would be looking at a 500 spine shaft for a 40# RC and a 29" draw. You will probably find you draw a RC about 28" maybe less if you draw a compound 29".
Pick up some different weight points to find the right tune, 145,175,200,250 gr. , points are cheap.
A 340 spine is way to stiff for that RC , even with a 300 gr point.
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