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Anyone using Benchmark powder in a 22-250 and 50 or 52 grain bullets. If so, what you seeing for velocity?
 

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Anyone using Benchmark powder in a 22-250 and 50 or 52 grain bullets. If so, what you seeing for velocity?
BENCHMARK is an Australian powder made by Thales so here it's called BM2 so I'll give you some reloading figures for both 50 and 52gn projectiles with estimated velocities.


50gn Min. load MV Max load MV

33.5gn 3720 36gn 3905





52gn.......................32.5gn 3605 34.5gn 3755
 

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Here is a quickload result for coated (HBN) 53gr Sierra or Hornady Match HP
mc (gr) fill (%) vel (fps) Pmax (psi) Z (%) t (ms) Pmuz (psi)
IMR 4895 37.1 98 3784 59000 99 0.9426 10745
Hodgdon CFE223 39.1 93 3783 59000 99 0.9364 10657
Ramshot Big Game 39.6 99 3777 59000 99 0.9360 10631
Winchester 748 37.0 91 3772 59000 100 0.9375 10272
Norma 203B 37.5 100 3766 59000 99 0.9441 10596
Alliant Reloder-15 37.3 99 3766 59000 98 0.9433 10632
Hodgdon BL-C2 38.5 94 3761 59000 99 0.9466 10488
Hodgdon H4895 36.0 96 3758 59000 99 0.9420 10428
Lovex S062 36.7 100 3721 58859 99 0.9512 10064
Norma 201 35.8 97 3714 59000 99 0.9524 10023
Ramshot TAC 38.0 93 3697 59000 96 0.9425 10200
Accurate 2230 36.5 89 3689 59000 99 0.9507 9765
Norma 200 31.8 86 3658 59000 100 0.9591 8828
Accurate 2700 39.3 100 3567 56713 93 0.9691 9466
Notice how close in velocity the first 8 powders are. I would bet that R-15 is the most accurate. Your Benchmark was designed for smaller cases (.223 40gr and its sister IMR-8208 .223 55 gr) according to the maker ADI.
 
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