The reason I always say 2% load increments is because that works with any and all cartridges. One whole grain might be a wee bit excessive if you happen to be working with a Hornet or Fireball or 357 Magnum!
If you examine loading manuals, you'll soon discover that the start loads are about 10% less than the maximum loads - no matter what cartridge or charge weight. If the "percentage of maximum charge weight" system is good enough for the professional ballisticians, it's good enough for me.
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