RE: how can you figure out how much your arrows weigh?
According to OT2 the 340's weigh 9.53gr/in. , the insert 16gr. and "g" nock is 7gr.
Blazer's are 5gr/ea.
A complete 28" arrow is304gr., but that'sWITHOUT the wrap. figure 6grs.for a wrap. Just ADD your tip weight.
I'm NOT sure if these are the spec's for the "Nano"...it does not say.
Hope this helps.