I don't recall if DW ever offered Dove Gray as a custom finish or not.
As far as getting extra barrels, you can use the regular ones even if they don't match exactly the custom finish on the gun. Your target will never know the difference. I hope the DW site does get updated as they promise, about the revolver accessories, parts, pacakages, and guns available. They claim everything they used to offer is still available. They did offer hunter packages in all their guns as far as I know. I it usually conssted of a 8" barrel with a factory scope mount. I have a 6" 44 mag "hunting package" barrel with no front sight slot and a factory installed scope mount. That is the hunting package I use with the 44 on a Monson made gun. It is so accurate it is spooky. The first time i sighted it in, although I could not understand why, I thought I was missing the target with subsequent shots because there was only one hole in the bulleye of the target. I finally noticed the hole was getting a little bigger and I did finally slightly cloverleaf one shot. I highly recommend the DW hunting packages.
It has been my experience, that when a "presentation" type collectible of any make is fired to any degree, the "collectible" value of it diminishes quickly. If you want to use it, I would not pay any more for the "presentation" gun than you would pay for a regular one, because if you use it a lot, that is probably all it will ever be worth.
Just my 2 pesos.
Roll Tide