Actually the MEC 600 Jr can be pretty easily set up to switch between 2-1/2" and 2-3/4" in 16 ga. (or 12 or 20, for that matter). MEC sells what they call a "short kit" which is basically a spacer that fits under the shell plate. I've been doing this for years and I'd be happy to advise, as I'm sure would most of the folks a in the 16 ga loaders group mentioned above.