I have shot plastic sabot rounds alot and using abs, pla, pom, nylon and polycarbonate. None of them fouled the barrel to any noticeable degree when using silicone lube. All three calibers actually cleaned the bore with sabots after there was some lead fouling. Shot with .357 using .223, .457 using .257 and the 20mm using .452 and .50 projectiles. Too much fussing and talking about how bad lead is, I call it BS from the eco people. We have shot cast and handled over a metric ton of lead and none of us have any measurable exposure that is to any degree unhealthy. Oh the birds eat it, and so on... lead sinks and is not so easily soluble to water as its too heavy, as for plastic well we have a plastic waste island floating in the ocean. How much does that kill fish and birds? Speak up on not banning lead and stop thinking about what to do with our hobby. Marko
Miles,While I participate in the sideline discussions in how to make projectiles from other metals, the bottom line is that lead is hard to beat, with tin as a reasonable non-toxic second.Bismuth is another non-toxic substitute that perhaps could be considered. I think bismuth is denser than tin, but has other shortcomings. It is used for shotgun pellets to reduce lead contamination of duck and goose habitats. It looks like 10 lbs of .18" diameter bismuth shot pellets is expensive, at $200. Turning that into slugs or pellets would probably double the cost:https://www.rotometals.com/bismuth-shot-bb-18-4-60mm-alloy-for-reloading-shells-10-made-in-usa/Here, bismuth pellets are fired from an airgun:I get the impression that pure bismuth is brittle. Perhaps a tin bismuth alloy could be considered:
Miles,While I participate in the sideline discussions in how to make projectiles from other metals, the bottom line is that lead is hard to beat, with tin as a reasonable non-toxic second.
If you read up on lead bullets used in firearms there is a limit to how fast you can push them before you get leading.