Re: 7mm saum 120 gr bullet
I have not shot 120's throw my saum yet, I stick with the 145-162's.
I looked throw most my books, nothing with the H4831sc. I did find H4831 with Barnes X Solid Bullet 63.0gr at MV 3077- 67.0gr at MV 3243 with 58,200PSI, and MIN OAL of 2.725".
My Barnes book shows IMR 4831 120gr TSX BT 61.0gr at MV 3178- 65.0gr at MV 3412 with 58,600PSI, C.O.A.L of 2.750"
The most accurate load in the Barnes book was WIN 760 60.0gr at MV 3211-63gr at MV 3394 with 62,500PSI, C.O.A.L 2.750".
Hope this helps..