Ok,,, I am trying to add this up...

Here it goes..
First just read a blurp stating almost 2000 fps from a 6.5in. Ruger single action...

That comes to 307fp inch. In order to reach the 2550fps.mark, you should need a little more than 8in.

So has any one started cutting down their 22in. barrels yet? Heck, might even speed things up a bit...

Yes, I know it does not work like that, but it does make you think...

Somewhere I saw a site that actually had data on velocity vs barrel lenght for the 17 HMR - they hacked off the barrel an inch at a time - what I remember is peak velocity occured at around 19" of barrel lenght. The numbers are out there you just need to search around some.

The data you seek is at www.bullberry.com

Ranb

Thank you... This is exactly the information I was looking for... I had a suspision that the longer barrels were not an improvment on this cal.

Again, Thank you...