can you provide a link that works? can you also explain what makes the UCHP expand more reliably, or am I misreading your meaning?
This uchp is the original gold dot, i believe. Speer made the original fully jacketed solid bullet. All it was was the heavily plated bullet that would hold up under impact and going through the bore. It was sold at a competitive price to regular jacketed bullets, at a huge savings in production costs, as reported at the time that they were invented. Then, the marketers decided to punch hollow points, and make a little bit more money. Hollow points were more expensive even back then. They were all, generally speaking, pretty inefficient. While the silvertip was considered one of the best 9mm, the scalloped remington another, etc, none of them managed to perform well enough. the silvertip clogged in the small opening. many, maybe even most of the available bullets from the sixties didn't even have jacket cuts, and had exposed lead that would tear off during expansion. The remington dropped weight as the big exposed tip tore off. current designs
when the FBI started investigating new designs, well, speer, along with every other bullet maker tried to not only get the law enforcement contracts, but to earn the eternal bragging rights to having created the official combat ammo for the law officers of america. This is when the special designs came into production for the gold dot, and it became a truly effective round.
Even as far back as the sixties, there have been plated bullets, not plated as the gold dot, heavily, but essentially a thin was to cover the lead. Probably thinner than the current series of thinly plated lead bullets. Gold dot are far more heavily plated.
I wouldn't use one of the old uchp. There are maybe even 100 designs that are far more effective. IMO, skiving the jacket is the one most important design, allowing for quicker opening while still supporting the lead mushroom.Adding a polymer tip or a very effective cavity design makes it even quicker to open, but that still leaves it needing a good jacket design to support the mushroom and retain weight.
Electroplated bullets go way back. The power lokt by remington was one of the originals. those gullets were just slugs that were swaged precisely to shape and weight, then plated heavily, and formed without even using an actual opening in the hp. Just a dimple in the bullet. The bullets, instead of blasting into lad and copper fragments, broke into fewer, heavier chunks, because you couldn't lose pieces of jacket. They claimed improved accuracy, but I don't know. I think that its amazing that so many great, fine designs were available over half a century ago, like the bronze point and power lokt, nosler partition, for example, and it took all these years to exploit those ideas.