Hi, here are some that I have used, similar weight cast bullet, with no problems. Note that it is a 3" barrel, so your velocities will likely increase.
Have fun, stay safe.
All loads should be verified. That is the standard liability statement.
S&W 29-4 3" barrel .44 Magnum Cartridge - mid-range loads, defensive loads
powder grains fps (low to high) fps (avg) Mean absolute deviation Notes
2400 15 823-898 854 28 fps, 3.3%
Unique 8.5 863-903 881 15 fps, 1.7% good choice
Unique 9 866-944 914 20 fps, 2.3%
HS-6 9.8 766-796 780 6 fps, 0.78% excellent potential
W231 8.4 885-896 890 4 fps, 0.47% my first choice
H4227 17.1 854-870 853 8 fps, 0.98% excellent potential
H4227 18.5 886-962 912 21 fps, 2.23%
Gun in 98% condition. Barrel/cylinder gap is 0.003". THESE WORKED IN MY GUN. BE CAREFUL.
Five rounds fired for each test. Notes: All extractions of fired cases were easy.
1.72 cartridge OAL Starline case, WLP primer, hard-cast bullets
All powder loads measured within +/- 0.1grain using RCBS digital scale, verified with Ohaus balance scale.
PM44-250K .44Mag .431" diam hardcast 253grains SWC 0.300" meplat, 0.800" OAL
Leadheads Bullets, Inc., St. John, KS 620-549-6475
Leadheads Bullets,Gas Checked and Plain Based Bullets
Sonny