Anyone seen one of these, know how much room is gained?
I drew one up, and it looks like the standard gets about 125g of water, and this one would be around 140g. Thinking about a 370 @ 2700 fps, wondering if it's feasable. (Leave the shoulder out of it for now....

Now that's an oxymoron... :P

Yes, you're right.
It's an excercise in overkill.
But I still want to know.
Hoping someone has better software than mine, and can give a good estimate of capacity increase.

improved and belt added...

416 weatherby...

jeffe

Bwana

For shoulder at .589,same location, Quickload estimates 140.7g.

rgds

steve

Thanks Steve.
That's about what I got by going .5692" and moving the base of the neck up for to .40" long.
That's a bit bigger than the Weatherby.
Thinking about a CZ, and the possibility of really fast spitzers.
Not that 350 at 2600 isn't fast....

Bwana,

There isn't any real advantage to be gained. You may pick up 20 fps! Big f...ing deal. These aren't like the little 22's with their light 55 - 70 grain bullets. It takes spoonfuls of extra powder to dramatically increase the projectile velocity.

Load you 416 Rigby with these:
Norma Brass
350gr Speer Mag Tip
CCI 250 primers
106gr of IMR4350
Muzzle velocity - 2820 fps from a 24" barrel.

If you are shooting the CZ you will probably pick up an extra 15 to 20 fps due to the longer barrel.

The ol' Rigby will launch 400 grain pills at 2700 fps too, when loaded to 63000 psi like the Weatherby mag.

The Rigby is just about perfect as it is. It's combustion efficiency is well matched to today's powders. As I stated earlier there really is no improvement, as you are simply reducing the cartridge's inherit efficiency and then making it up with a little more powder.

Scott