UPDATE: I finally found a source!!
So I finally found
Straight Shooters Cast Bullet Company back in West Virginia, who makes a pure soft lead SWCHP that is polycoated. It also includes a gas check.
https://sscastbullets.com/product/357-38-hp-pb-gas-check-hi-tek/
Normally, with the polymer coating, unless driven to magnum velocities from a carbine, like 1500 fps or more, a gas check would not be required,...if the projectile was the more common hard cast composition, such as Lyman#2 or 92-2-6 (92% lead, 2% tin, 6% antimony), often referred to as "hardball" or "hardcast", the Brinell hardness value of that common standard is about BRN16. Harder lead alloys for rifles are usually about BHN22. Softer malleable blends for use in old cowboy guns with sloppy/larger/worn diameters often use a BHN of 10-12.
But to ensure this projectile will duplicate the old "FBI Load" and open at standard .38spl velocities from a snubnose revolver, this thing has a BHN of only 5. That means 100% pure lead, with no alloy additives.
Even most home hobby casters avoid casting anything with absolute pure lead because it can actually be a bit of a pain to cast well. And without any tin in the mix, the result is often very dull and not shiny, so just doesn't look very neat. However, the polycoating hides that and looks neato.
Unfortunately, those same difficulties, as well as the hollow-point, make it impossible to produce these with the same degree of automation as your common round-nose 9mm. There is more labor involved on manually operated processes, so these are not as cheap as a regular .38 SWC and cost slightly more than double, at $0.46 cents each.
Yeah, I know,...but I've always wanted to duplicate the awesome performance that we used to see in the Nyclad line from S&W (later sold to Federal).
