With shotshells you stick with the manuals. There are no warning signs of over pressure. You don't experiment and never assume anything. The powders you mention are good powders however the Blue Dot is for heavy loads so for target shooting it's out. I use it for my sabot slugs and it is a great powder for that. I will say though that it is a very dirty powder with my slugs. The Unique is a good all around powder that can be used in the 12, 20 and 28 ga loads. I use it often for my 20 and 28 ga loads. Lately I have been using Red Dot for my 12 ga target loads. I load 1 ounce loads and it is a good powder for that and it is available here. There are many good powders for shotshells and most have their favorite which often depends on availability. The wads you need will depend on the hulls you load and the amount of shot you put in them. The data in the manuals will tell you which to use with which loads.