Haha, sorry, I will have to take a slight issue with this. Zero bullets are
fine bullets. They aren't horrible, they aren't dangerous, they aren't "sub-standard" bullets.
They don't meet almost any real definition of "excellent" however, and that is my opinion, of course. Nosler makes fine bullets, Hornady's XTP line are fantastic. Sierra has a phenomenal reputation for excellent bullets all across the board. Most of the jacketed handgun bullets that are sold in 50 or 100 piece boxes could easily be argued as
excellent.
Zero bullets are an absolute budget bullet line and typically sold in volume. 500 or 1000 pieces at a time and many of us buy thousands when the opportunity presents itself.
I have used a kinetic bullet puller on occasion to tear down a round for whatever reason... and with a Zero bullet, I was able to tap the lead core right out of the
cannelured jacket, leaving a loaded cartridge case with only a flyweight copper jacket roll-crimped in to a .357 Magnum case.
Zero bullets are a fine blasting, plinking, fun-shooting bullet that's typically going to be easy on the wallet compared to premium bullets. But if these are even loosely defined as "excellent", then we have to find a far more descriptive term for the industry's FAR BETTER jacketed handgun bullets, of which there are many.
Load data? Use typical, known safe handloading practices: find 2 or 3
published loads from respected sources and begin either at the start charge listed for a 240gr jacketed slug, or start at least 10% under the listed maximum load.