Swapping lead for bismuth in subsonic cartridges

Nothing whatsoever against steel in 12 gauge, but with pretty much full choke and preasure markings that suggest I probably shouldn't even be using modern lead cartridges, I would rather explore other options. (Not even sure if subsonic steel are available in any gauge?)
Edit. Looks like 12G subsonic steel are available, but the chances of them producing subsonic 410 are slim due to the limited market.
Yeah the 410 is likely dead if we cant use lead or Bismuth !
Steel SHOT PATERNS TIGHTER .
 
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