There is a lot more stress on the gun shooting cartridges, even with black powder as there is better compression, a much heavier and harder bullet and more energy.
The (bronze gunmetal) brass frame is too soft in the thread areas, and will stretch, (even the steel frames will stretch) and I have found, especially with the Colt types that they wear out very quickly.
The Remington frame is stronger than the Colt, but I wouldn't subject the brass frameto a cartridge conversion in 45 Caliber, and they don't make a 36 brass framed Remington that I know of.
You can more than pay for a more suitable steel framed gun with the expense of converting a 44 to 38 just to save buying another revolver.