I forgot to mention the loads with small pistol primers will have the speed reduced around 20 to 30 fps more or less. Sometimes this helps with accuracy. If you are loading for competition and need to meet a certain power factor you may need to add .1 grains of powder to your pet load to be sure you do meet the power factor they require. The average person punching paper or shooting steel at the range probably will never notice the difference between large and small pistol primer loads if everything else is the same.
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