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Same spine but different weights?

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ntvbowyer1969:
I found the weight doesnt matter that much at all. unless you are talking crazy difference . Esp. if you only are shooting at game 15 yrds or so.Shooting a heavier tip will make the spine of the arrow drop. I feel it is more important to keep same spine and dont worry about weight so much.

ohma2:
It takes quite a bit of difference in weight at short distance to show up.as said shoot them set up the same way.as said a couple flu flu with the heaviest is always fun to have. 

archeryrob:
I agree with the last two responses. English arrowsmiths in the past used weight to judge shafts because they didn't have spine testers. You have one and pay much more attention to it than weight. Pay attention to weight for Kinetic energy and hunting penetration.

A much heaver arrow will load more making it change dynamically, but I highly doubt 30 - 40 grains over the entire length will matter. Changing your point weight will highly make a difference, far more than shaft weight. lowering the point weight to match the other shaft will likely make the two shafts not shoot the same. If you go by spine, stay with it.

Pat B:
Adding weight to the point end of an arrow is effectively reducing spine weight. For every 25 grains of tip weight you add over the standard 125gr will reduce the effective indicated spine weight by 5# and the opposite for the reverse.
 I think that when your target is 30 yards or less away spine is critical because the arrow has to straighten out in a relatively short distance. With the English war bows, they were shooting a few hundred yards so the arrow had plenty of time to straighten out before it hit it's target so spineing arrows wasn't critical. I also think if the war bow guys wanted to check the deflection differences of their arrows so they could spine test each arrow they had the technology to do so. It just wasn't necessary.
 

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