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I have an article by Simon Everett that documents two new Holland and Holland cartridges. First is the .400 H & H magnum which is a .416 diameter bullet from the .375 H & H case at about 2,375'/sec (another .416 Rem Mag so to speak) It's factory loaded with Woodleigh 400 grain bullets.
The second new round is the .465 H & H magnum is not yet released because load developement is still in the works. The author doesn't say so but it seems the .465 H & H is another .470 capstick or .458 Lott with a .465 bullet.
Ft-Lb energy seem to run about 4160 for the .375, 5,000 for the .400 and 6,000 with the .465.
Wrong, bullet diameter for the 400 H&H is .411.
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