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Thats because the factory loads are developed using testing guns which arent the same as what you buy in the store.

Thats also why the recomendation is to start at the bottom and work up. The book is a guidline that gives safe minimums and maximums for a given combination of components.

Different guns cases primers powders bullets all can increase or decrease pressure.

Lots of factory loadings use blended powder which is combinations of 2 or more powders to give different properties across a wide range of firearms.

When handloading you can be more precise than factory ammo for a given firearm. Factory tevhnicians can only guess what firearm the ammo will be used in while you know exactly. This lets the handloader develop ammunition tailored to a specific firearm.

The most accurate loading is usually not the fastest one. Speed of a bullet is irrelevant if all it hits is dirt around the target.
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