I guess I'm getting old and lazy. I'd rather be flying rockets than preping them. It just takes a bit of extra time and materials to build in or add on an ejection baffle. I mostly use the 3-D (or 4-D) style; a series of (just over) half-round bulkheads aligned so that the successive baffle is rotated 180 degrees from the previous. So the question of the day is: "How far from the end of the motor should the first baffle be, and how far should the successive baffles be spaced?". I guess the best way would be to answer in body tube diameters (or motor mount diameters if you're building a rocket with an extended motor mount/stuffer tube).