I have done a lot of research on this subject for my 629 with the 8 3/8" barrel. For me, I like to keep the loads around 850 fps. These are in order of accuracy I use; 6.5 grs. of 231 or hp38 then 6grs. of WST, then 7grs. of Auto Comp. The Unique loads you use are good ones too. I just like the area around 850 fps, both in 44 mag. cases and 44 Special cases. I just use 1/2 to a grain less in the 44 Special case to get the most accuracy. I don't know why, but that's what I have found over the years.

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AM-Tracks 66-69