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Good news on the Hodgdon BENCHMARK (ADI Benchmark 2).

Rifle was Freki the FN Mauser with 24-1/4" Pac-Nor No. 5 Sporter, 1:10" twist.
Scope: Leupold FX Freedom 3-9x40mm Muzzle Loader UltimateSlam Reticle,
Scope Mounts: Near MFG Rail, 8x40 screws, Burris Xtac Low Rings

400-gr CEB Safari Solid "Special" Brass FN: COL 3.360"
BOL = 1.225"
G1 BC = 0.180
Norma brass
GM215M primer
69*F
78.0 gr Benchmark with drop tube: Not Compressed, ~ 99% fill
5-yard chrono for 5 shots, mean = 2481.8 fps ... corrected to MV = 2506 fps
5 shots went into one hole at 50 yards.

404-gr Shock Hammer: 3 different COLs, 3.380", 3.480" and 3.580", just could not bring myself to do 3.280".
BOL = 1.440"
G1 BC = 0.419
Norma brass
GM215M primer
69*F

COL 3.380"
78.0 gr Benchmark (mildly compressed): Chrono 2453 fps mean ... MV = 2463 fps, accurate
80.0 gr Benchmark (more compressed): Chrono 2589.8 fps mean ... MV = 2600 fps, not as accurate

COL 3.480"
82.0 gr Benchmark (mildly compressed): Chrono 2610.25 fps mean ... MV = 2620 fps, accurate

COL 3.580"
84.0 gr Benchmark ("full case"): Chrono 2602 fps mean ... MV = 2612 fps, most accurate

Target pictures and further discussion to follow.

Stocking up on Hodgdon BenchMark is recommended.
Excellent for 400-gr to 550-gr bullets in the SAAMI .458 WinMag and same with .458 WM+ loads.
Best level TBI.
Tiny little extruded grains meter very well, like the ball powders.