Terry I sent you a site {www.Bowjackson.com ] a few week's back ,I'd check on there to see what your FOC is,pick the weight of your broadhead from there ,I'm sure you'll find the 100gr to fit accordingly ,but once you find your FOC that will determine the correct weight of head you should use . Just follow the instruction's that are given to you ,it's very easy .I hope this help's you out .I'm shooting Montec's G5's 100gr out of my dually and they're perfect ,I don't figure you need anything more .Your arrow's are definetly heavy enough for bear .

nubo