| kuduae |
| (.400 member) |
| 06/07/22 05:14 AM |
Re: 10,75x63 by Rodda Calcutta
|
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The 10.75x68, .423 calibre was reported as a failure on DG. Eg Harry Manners, Kambaku. Who switched to a .375. The principal claim to the failures was bullet construction.
And misunderstanding of loads and bullets. F.i. the OE expanding bullet (discontinued 1934) looked like a full metal jacket round nose, but was designed to expand. So it failed to penetrate like a solid, of course.
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lack of field users.
The 10.75x68 was unpopular in British Africa only. Especially after Taylor’s misconceptions and prejudices were published. But it was the standard big game number in the former German colonies and in all French, Portuguese and Spanish Africa.
South African Pierre van der Walt in his book “African Dangerous Game Cartridges” has a whole chapter on the 10.76x68. He and many of his relatives and hunting buddies are using the cartridge regularly for decades by now, not only on large plains game like eland and zebra, but on buffalo and lion too.
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Can a 400 gr .423 bullet be loaded in a 10.75x63 or x68? At what velocity? If 2100 fps or even 2150 fps? Zero practical difference to the old .404 Jeffery.
Pierre gives several loads with 400 gr bullets in the 2100 – 2200 fps range, f.i. 61gr H335 for 2142 fps, 74 gr WW748 for 2208 fps, or 56 IMR 4198 for 2140 fps. Apparently he favors lighter bllets for cats, lions and leopards. He has 22 loads for the 347 gr Woodleighs, top speeds 2360 to 2400 fps. With such handloads he rates the cartridge on par with the classic .450-400 NE and .404 Kynoch loads.
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Is the barrel twist rate the same?
Mauser, Oberndorf, used the same 420 mm = 16.5” twist for the 10.75x68, .404 and .416 Rigby.