fun factor beats 'market value'....
Big +1. Not much fun to look at a gun in the safe you wish was something else.
I built a .17 Ackley Hornet about 20 years ago on an Anschutz action, pre-Ruger of course and killed quite a bit with it, but always wanted more power. I would look at a .17 Fireball. With Rugers cartridge now standard, I would never build an Ackley version. What a PITA forming brass when it's not necessary!
