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Keep in mind IBO standard is also the warranty limit for many manufacturers. AMO standards use a heavier arrow and therefore result in lower speeds. IBO is basically what a bow is capable of (from a speed standpoint) without blowing up/causing damage. The lighter the arrow the faster it may be but there are trade offs. Your bow will most likely not be as efficient and therefore more energy is transferred to the limbs/cams/string, etc. This will make the bow louder, cause hand shock/vibration, and shorten the lifespan of components. Some bows are rated to go down to 2 or 3 gr per pound but most are rated at 5. If you shoot below that given weight it will void the warranty and could cause damage similar to a dry fire.
 
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