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As Carver said, different construction methods might make bullets that react differently to being pushed through the bore. An extreme example would be a cast lead bullet vs. a conventional jacketed lead-core bullet, vs. a pure copper solid (like a Barnes X design). Each of those bullet types react differently when pushed through the bore.

And it is also possible that there was just different results when the two companies developed the load data for their particular bullet. Each company that develops their own data might get different results during their testing. Typically, most bullet manufacturer's manuals only include the "top candidates" out of all the powders they tested with their bullets. If it was a poor performer (during their testing) it might get omitted from the list.
Even if they used the same powder, they might've gotten different results...whether it was because of a different test firearm, different lots of powder, etc.
Many variables come into play, which is why it is a good idea to have several different manuals on the shelf and use them on a cross-comparison basis. If a certain load is listed as functional in more than one manual, then it is most likely a good performer.
Once you've found a combination that looks like a promising candidate, now it's time to give it a try in your own firearm.
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