| 4seventy |
| (Sponsor) |
| 08/04/11 05:19 PM |
Re: Mauser 98 from 1925.
|
Quote:
The 10.75 x 68 and the 404 Jeffery as loaded by the Germans were one and the same calibre, the bullet diameter for both these cartridges being 0.423” or 10.75mm (the .404 aka the 10,75 x 73).
You are most likely correct, but thesedays Woodleigh gives .422" as the bullet diameter for the 404 Jeffery, and 10.75x68 as .423".
As the cartridge pictured is loaded with a Woodleigh bullet, I listed it at it's supplied diameter of .422".
Norma quotes bullet diameter for the 404 as being .423" in their cartridge description, but show it as .422" on their drawing of the 404 cartridge on the same page.
NORMA
Quote:
The 10.75 x 68 can be loaded with a 400gr bullet at higher pressures to match the old low pressure cordite .404 loading but note that the .404 factory loads using the more modern cordite and nitrocellulose grained powders were upped in velocity by a 150-200fps.
The 10.75 x 68 can never catch up to the modern .404 both in factory loads or reloads, an impossibility based on the quite different case sizes.
When I said the 10.75x68 could be handloaded to equal the 404 Jeffery, I was most definately referring to the ORIGINAL ballistics of the 404, that being a 400 grainer at 2125fps in a 28" barrel.
That is the velocity which gained the 404 it's fine reputation.
There is NO WAY that I was suggesting that the 10.75x68 could ever be handloaded to equal what the 404 cartridge (factory or handloads) could be loaded to. (at higher than original pressure)
Quote:
If loading the 10.75 x 68 with the 400gr bullet the OAL will be out of spec if crimping into the cannelure, the 10.75 x 68 having an OAL of 3.165” loaded with its 347gr bullet, and requiring an OAL of 3.320” if crimping a 400gr to the cannelure. While acknowledging that 4seventy is showing an example of this 68mm cartridge loaded with a 400gr bullet, a longer loaded 10.75 x 68 cartridge could present difficulties with throat length and magazine length considerations.
That's true, and of course the same goes for any cartridge which is being handloaded with a longer bullet than what was originally used.
Quote:
With a well made 347gr bullet the 10.75 x 68 can still be increased in performance with modern loads and higher pressures and should perform well on big game though it will never make it into the realm of the .404.
But that is the point, the 404 gained it's rep from it's original ballistics, not from more recent higher than original pressure and velocity loads, and the 10.75 x 68 can be handloaded to equal that original 404 Jeffery velocity, bullet weight, and diameter.
