1 - yes
2 - yes
3 - yes? (haven't recovered bullets, but did get a deer this year)
4 - i have been able to get good groups (only sighting in at 50 yds) with BP; didn't have as good of luck with sabots

I have always been a bit skeptical of the copper hollow points, but still use them. I would like to see them come out with a lead jacketed hollow point (like you might see in a .44 cal bullet) or simply a lead nosed bullet (like a rifle cartridge). just seems like they would work well (better?)