I spent some time today testing broadheads in my SZ380. Here is what I came up with. Thunderhead 100grn 3 blade: Very poor flight, all over the map / Muzzy 90grn 4blade pretty much the same / Thunderhead 125 would group but low and right / G5 montec 100grn was awsome, it flew right with the field points. I am going to test Muzzy 125 3blade, and both G5 montec crossbow 100 and 125 tomorrow. My test were done out of a gun rest at 40 yards. So far I am sold on the G5's. Please chime in if you have any input with your setup.