Each powder can have different temp/time requirements, so you'll have to go by what the manufacturer recommends, but 10 min @ 400* F is pretty common for the powders I use.
I think the 10 minute spec is for time once everything's up to temp, so I bake for 20 minutes, allowing the first 10 min for the bullets to heat up. Cooking longer doesn't seem to hurt anything, within reason.
It is very important to hit the right temperature though; don't just go by the dial on your oven. I have to set the dial on mine a little past 500* to hit 400* actual temp, but other ovens might be down at 200-300* for the same result. Toaster oven temps seem to vary a lot more than regular kitchen ovens.
Regarding different powders for different velocity - not really; a powder that works well at 3000 fps is fine at 700 fps too. You could just use one good powder (like the green one above) for everything.
Last edited by Yondering; 07/17/16.
