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I don't think the powder charge weight really matters, its the velocity that counts.

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Lets see.

Calibre / Bullet Weight in Grains / Bullet Velocity in fps / Powder Weight in Grains / Gun Weight in Pounds

A original cartridge loading.
.404 - 400/2150/85/9 - Recoil Energy of 49 foot pounds, and Recoil Velocity of 19 fps.

Assuming a modern powder with the same powder weight gives a higher velocity.
.404 - 400/2400/85/9 - Recoil Energy of 61 foot pounds, and Recoil Velocity of 21 fps.

Increasing the powder charge increases the recoil energy considerably.
.404 - 400/2400/105/9 - Recoil Energy of 69 foot pounds, and Recoil Velocity of 22 fps.

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John aka NitroX

...
Govt get out of our lives NOW!
"I love the smell of cordite in the morning."
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