A:
About 25 grains... Ha Ha!
Really though, 125 are heavier and are used with a little heavier arrow for more penetration. I use 100 grain and find them to be extremely effective for taking white tailed deer. If you use 125 grain then make sure you buy arrows that match. This can be accurately done by using the information provided on almost all arrow boxes. A graph is provided on the box so that you can match the arrow, broadhead grain and bow # pull.