I have done all 3. I always have a small bowled pipe for super stout blends that I can't smoke much of at one time and they double as a quick smoke pipe. I have also loaded a half bowl in a larger bowled pipe but I'm not a big fan of it. I never seem to get a proper pack when I try to pack a half bowl. As far as letting a pipe go out and relighting it later, otherwise known as DGT (Delayed Gratification Technique), it depends on the tobacco. I have found that blends containing latakia usually get dirty and harsh at relight, Virginia/perique blends the same, aromatics can go either way, but straight Virginias...I DGT them on purpose sometimes because I love what happens to a Virginia when charred, allowed to sit for 2 - 4 hours or longer and then relit. I never dump ash. I just tamp it down and let it go out. Never had a bowl keep smoking on me. The Virginia go from sweet and spicey to deep, dark, roasted espresso and cocoa.