RE: loose powder or pellets
I have used both and really what ever works I say go with it. Personally for hunting I like the idea of pellets, especially when you consider how nasty it can be in these parts come October. I have been lucky that 100gr. pyrodex with 240XTP's provides me with excellent results, as such I use loose to practice with and switch to pellets right before season. It hasn't caused me any problems and is much easier on the pocket.
This year I am going to try loose T7 and if it goes well I will be back to carry a measurer. I wouldn't bother with T7 pellets for reasons mentioned already.