Thanks for the info, Dan. I'm trying to accumulate is what steel shot sizes and what powder-to-shot ratio people have had real-world success with. Yours is essentially an equal-volume load for 1.1/2oz of lead shot, with 3Fg; the few others I've heard from have gone a bit heavier on powder than the traditional equal-volume loads (~1/2-3/4dr depending on shot charge) but with 2Fg, so you're likely in the same range for velocity (1275-1300fps at a guess) or a bit faster. Fe #3 seems popular for ducks and maybe Snows. It's probably what I'll use for an affordable duck load, but it's good to know it works on Canadas, too, if the opportunity arises. My shot of preference for Canadas will likely still be from my dwindling supply of expensive BiSn #4s.
In my first (and only, so far) tries with the MultiMetal wads, I discovered that uniform slitting was critical, or on firing, they would tear off one petal, giving an out-of-round pattern. I haven't figured out how, and how deeply, to slit them to stop this. The other problem with them is that they only hold ~7/8oz of steel.
My range is going to be limited, anyway, as my 16gs is unchoked.
Concerning The Baron's not using shot cups, Bismuth-tin alloy shot is no harder or abrasive than high-alloy lead - probably something like linotype or maybe OLD wheel-weights (about double the alloying of current clip-on ones). The hardness apparently partly makes up (in penetration) for the somewhat lower density compared to lead-alloy shot. Lots of shooters use it without bore/shot protection in muzzle-loaders and no-plastic-on-the-ground traditional cartridge loads.
Tungsten-polymer & the nearly identical tungsten-matrix have the tungsten powder suspended in a plastic (nylon?) matrix. Neither is currently available in loose shot in North America. They are soft/deformable enough for use in old thin-wall chokes, and apparently not abrasive, either.
The only other traditional-load-friendly material currently available in bulk shot is NiceShot produced by EcoTungsten, with tungsten powder suspended in a tin matrix, and coated with tin for bore protection. The bulk hardness is about like current wheel-weight alloy and the density is similar.
Everything else available here in loose shot (that I am aware of) is too hard and/or too abrasive to use without SERIOUS bore protection.
Baron, I thank you as well, for the same reasons - real world experience is always valuable in expediting the development of effective loads and thus preventing mistakes on game.
Regards, gentlemen,
Joel