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Slower powders ignite less easily, burn less easily, and also require more pressure and heat to properly sustain efficient combustion. Slower powders need larger charges to do the same thin as quicker ones. They function better with longer barrels that allow the charge a longer period of time to fully burnt. They function best with heavier bullets that allow pressure to build,pressure and heat that are essential for the powder to ignite and efficiently burn.
Fast and slow are simple ways of cataloguing them, but if he truth is told, this is really a complex set of properties and variables that are really hard to predict. This is one of the reasons why data can sometimes seem completely arbitrary, and why you MUST approach maximum loads with a little caution. Throwing changes into a carefully balanced process changes it. Changing bullet weight, seating depth,brass weighting number of things will upset that balance and can cause failures, including destruction of the gun and personal injury.
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