I've found that Bullseye, 700x, Herco, and 2400 are much more versatile than the current manuals would lead you to believe. I've used all four powders for a variety of loadings from .38 special to shotgun loads, with each powder excelling at a different level. (Don't punish me for using Bullseye in light 12 target loads. I got the recipe straight from an Alliant employee.)
700x and Herco are the only two of these powders I would atually recommend for shotgunning, and I always stay spot-on with the published data. I have used Herco and 2400 for heavy 20 gauge hunting shells, but they are not so good for run-of-the-mill medium and light target and field loads. There are much better powders out there for shotgunners to use, but the point is -- these four powders are more versatile than we might think. A long talk with the old timers at the range where I shoot verified that these powders, and many others, have been used for a great variety of metalic and shotshell loads in times past. A glance through some antique reloading manuals will verify this.