Funny I fished that system for years. From what i found, no matter what we chucked at them at Billings, we could never get them fair hooked. But above the bridge it was quite easy to hook them in the mouth, if fact have seen many chase the fly down and take it. I do believe most of the fish at billings are foul hooked and half the people down there are trying there dambest to snag them. A chum is not going to kill its self chasing a buzzbomb period.