while it seems like a logical assumption that all broadheads are sharp right out of the box, i have heard this can be unreliable, especially with off-brand broadheads. I have heard of the rubberband trick, only using a single one and pulling the blade across. If the band is cut with one pass and no sawing action, it is good for the most part. Also, visually check for any knicks / defects in blade. These will most affect sharpness and can usually be seen with naked eye.