Question about barrel length

[Alleycat]

Originally Posted by alorton

I would have thought taking 5.5" of barrel off would have made a larger difference than 100fps. Is this due to using such fast powders in the Whisper?

As a rule of thumb, it averages about 20 to 25 fps per inch in most cartridges. It's by no means certain. Guns are a lot like women. They all have the same parts, but some are just crazy.