Sir Ron,

BENCHMARK or BENCHMARK 2 (BM2) as it's known in Australia is all l use in the mighty .458 now...

And in regards to the velocity the excellent Woodleigh manual state, here's what l got from the 24" barrel from my Zastava loaded to 3.340"

550gn Woodleigh and 73gns reached 2080fps which was only 30fps under what the manual stated
And
450gn Hydro and 75gns reached 2320fps which was 40fps above what the manual states.
(I now load 73gns - same as my 550gn load which gets me spot on 2280fps)

BENCHMARK is a truly wonderful powder for the king of cartridges.

Russ

You'll probably never NEED a gun. In fact I hope you never do. BUT IF you do, you will probably need it worse than anything you've ever needed before in your life...