How to figure out the weight of 22 inch head hunter bolt and the beeman 22 inch bolt,the two different bolts do not shoot the same, So I figured one bolt weighs more than the other. How do you find the weights.

I weigh my arrows on the same digital scale I weigh bullets and brass on. I make a cardboard collar with 2 v notches. Toilet paper tube works good. Set the scale to zero with the collar on board..balance the arrow on the collar to weigh.

It could be a spine difference also.