Question about barrel length

[alorton]

Originally Posted by Alleycat

Depends on what you're doing with it. If you only shoot subs, the answer is there will be no difference. 1050 is 1050 regardless of barrel length. If you're shooting super, It may take about 100fps off. Which will equate to about 2" @ 300 yds. I can live with that.

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?