There is no indication of what area you live in and that alone can be a big factor...
S&W handguns, and especially P&R and earlier models fluctuate frequently in value and popularity. Each specific model tends to fluctuate in price currently by barrel length based on urban ownership or rural, home defense, hunting or range usage.
Certain caliber ammo prices do have a buying impact with some people. Many 22 caliber models have been sold primarily for their comparatively lower ammo costs. The same lower cost of ammo has been a factor for many 38 Sp model sales through the years.
Some sales trends are easy to understand, others are not.
The 41 Mag used to be one of the slowest sellers in the Pac. North West. In recent years the versatility and usefulness of the caliber has generated a huge new following. It has become the most difficult caliber to find in good condition in any barrel length in my area, and for that reason they are commanding the higher prices well beyond the 27's and 29's. Perhaps not so in some other areas.
Supply and demand, both in original production numbers and current shooter/collector interest always enter into the factoring. A close second is a sudden unexplainable popularity that can be fleeting and can change almost overnight.
Handgun collecting, hunting and shooting have been interests of mine for over 40 years. I've seen popularity and preferences for guns and calibers change frequently and unpredictably. I don't see anything to change that outlook in the future....
Just as a reminder.... Mod 25 ACP's were pinned only. Only the magnum and rimfire models were recessed.....
JMHO