Rev,
Welcome to this Forum; I see this is only your 13th post.
I also like old Colts and Old Smiths. Your M29 load of 8.0 grains of Unique and a 250 grain LSWC bullet is my M29 .44 Special load. I go up a few grains for the M29 Magnum load with the same hard cast bullet. I went to S&W Armorers School twice and asked your question about "shooting loose" the M29.
No, not to worry about shooting loose. Smiths will develop "end shake" after a diet of heavy loads in the .357 and .44 Magnum chamberings. An armorer can correct the problem in 15 minutes, until the next time. I "tune" my Smiths, as needed.
Again, welcome to this site.
Adam
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Adam Helmer
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