since i sell retail i know a bit about things like this. In some cases brands actually do the private label product for retailers. So the bass pro shop brands could very well be the same product as berkley, strike king etc.... and its just in a different package.
I know bass pro shop, walmart, ctc, homedepot, lowes, homehardware all do this. It helps promote there business.
And yes sometimes it is product made offshore that they can sell at higher margin, but alot of cases its for there promotional benifit more then profit.
Cheers!