Captainkirk, I have a few reasons for dropping my charge to 24 grs. One of those is the dropping of the loading lever with heavier charges and/or heavier bullets--I've already attended to the usual fixes for that but if I get over 45 grs I can look for problems. Another reason is potential cap fragments/sucking due to heavier charges. The mainsprings on the Dragoons are fairly heavy and reduces this tendency, but I don't want to worry about this in the middle of a stage at a Cowboy Shoot. Cowboy Shoots are my main--and frequent-- use of my blackpowder guns, both percussion and cartridge. Especially the cap & ball pistols require a bit of special attention to complete a day's Match in a trouble free fashion. So, anything I can do to insure this is worthwhile to me. That mentioned 24 gr load reliably knocks down targets as well.
So if I will be out for a day's relaxed shooting, where there is no urgency and I can clear cap fragments/dropping loading levers, then I go back to the old reliable load of 42 grs.
45 Dragoon, I share your enthusiasm for the Dragoon models. Despite their size and weight, they still have that familiar "Colt" feel to them, where the Walkers do not, at least in my opinion. I have been neglecting the Dragoons a bit lately, something that is about to change. As I mentioned in the first post, I intend to return to more "paper punching" in an effort to regulate accuracy/POA in all my guns.