Yes, 100 yards is a good max range, mostly due to the open sights, at least for me. If you have better eyes and/or a better sight you could possibly extend that to 120 yards or so. For powder you might start out with Triple 7 as it is easier to clean up and less corrosive. Just remember it's "hotter" than other powders and you don't need to use as much. For me I will never use more than 100 grains of 2F Triple 7. What kind of caps is it set up for?