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As to difference in velocity, I've chronographed some .357 Magnum loads that are considerable higher out of my 4" Model 586 that out of the 6" gun. This with Hercules (now Alliant) #2400 powder.
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This is not unusual and why comparing the velocity between 2 different guns is not reliable. If you were to shoot the same loads through the same gun, starting with a longer barrel and cutting it as you measured the velocity you will see pretty consistent velocity loss.