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need help

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so i went to the bow shop and got a new cam the guy told me i need a lighter arrow b/c i was shooting a 420 grain arrow with feild point he told me to drop down to a 385 so does this mean with a 10 grain tip to?????
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I need to know your setup! I shoot a 414gr arrow and with 55lbs. The spine is what you need not the weight. I can shoot a light .400 spine or heavy and the end results will be the same, just that with a lighter arrow it will be faster.
Pat
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I lighter arrow will give you more speed but a heavier arrow is more forgiving and it extracts more energy from your bow. So unless you have a need for a very slightly flatter trajectory or have some other sort of issue why change?
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I don't claim to be an expert, but I would keep shooting the same weight tip and lighten the arrow shaft to the 385.
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There's no wrong answer. Some people shoot a very heavy arrow, and that has it's benefits (quiet, great kinetic energy...but slower). I don't like an excessively heavy or excessively light arrow. Most bow companies recommend a MINIMUM of 5 grains per pound of bow weight. This would put you between 325 and 350 total weight for a 65 or 70 pound bow. I think around 385 would be a good reasonable weight. You'll shoot a little flatter and therefore your pin gap will be a little more forgiving towards yardage estimation.
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When dealing with lighter arrows you have to also keep in mind your Draw Length also. I am a 30' draw shooting Carbon Express 350 Maxima's out of my Bowtech 82nd Airborne at 70lbs with a 100grain tip. My arrows are screaming fast but I wouldn't go lower where a guy with a shorter draw can go lower. Just a little help.
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