That Cherry's site mentioned in the old thread currently has the BoarBuster at an even $2K
Cherry's Pedersoli modern rifle page
$2K really isn't out of line for a "semi-custom" rifle.
I see true custom rifles at $5K all the time and even that barely gets you in the door for a double.
Then again you can have any twist you want in that true custom.(1)
I notice that they also make a hammer double like SIACE but only in 45-70. 1/18 twist.
You would think someone would notice the discrepancy in the twist rates between the 44 and 45.
Theoretically the 45 needs LESS twist for a given weight bullet as they are shorter.
(1) My current custom dream rifle would be a High Wall in 444 with heavy 24" bull barrel and double set trigger.
I'd have to think about the twist. 1/25" calculates out as good for everything I would be doing.
Certainly working wonders in my 17" Encore 445 but the 300's are about as heavy as I go in that one.
18,20,25 and 38 seem to be the only 44 caliber twist rates available off the shelf from the barrel makers like MGM or Pac-Nor.
Caliber and Twist Rate Chart - PAC-NOR Barreling, Inc.
I know there are guys with smaller shops and a sine-bar machine that will make anything you want.