Most revolvers with adjustable sights have a limit to their adjustment range. In fact, my Model 29 (8 3/8" barrel) could not be sighted in with standard .44 magnum loads until I had the front sight replaced with the correct height.
My 625's have Red Dot sights on them (Simmons RD's) and they have far more sight adjustment range than the iron sights. That is often very helpful when you want to shoot a "non standard" bullet weight.
With my 625's, I can shoot from 185 gr to 255 gr bullets and still get a good zero with the Red Dot sights. The .44 Magnum has a much wider velocity range than any .45 ACP would have and with iron sights that can be a problem with lighter or heavier bullets. Most of the Smith's have pinned on sights, and if yours is, you can replace the front sight to one you need.
Dale53
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