At my request, Mr. Zeglin sent me the limited set of performance data on his .416 Aagaard wildcat, which is the .376 Steyr improved and necked up. All tests were done with a 21" barrel (the wildcat and gun were built to a customer's specifications).

With 350-grain Speer Mag-Tips loaded to an OAL of 3.1", he got just over 2300 fps with 65 grains of H4895. A three-round string had a standard deviation of 7.8 and an extreme spread of 11 fps.

With 400-grain Hawk bullets loaded to an OAL of 3.175", he got 2160 fps with 64 grains of RL15. A three-round string had a standard deviation of 4.9 and an extreme spread of 7 fps.

Looks to be a .404 Jeffery equivalent in a more efficient cartridge that fits a standard length action and probably generates less recoil, if the difference between the .376 Steyr and the .375 H&H is any indication. Very interesting...

What's the difference in pressures, with same bullet weight/speed?
All the 'cats in their line look interesting to me, especially the 338.
Now, I just can't understand Steyr's decision on case length. Won't fit in a short action, wasted room in a standard length. I think the "original" Brenneke dimensions would've made a fine .375-bore indeed.
Come to think of it, what a fine case that is.
Right in between the .375 Whelen Imp and H&H.
Water capacities: 98 114 132 -grains.
Someone needs to start mass-producing those cases to give wildcatters something to chew on!
I wonder how the Steyr compares to the .375 Wh-Imp. Seems like about the same amount of powder room, just a bit shorter/fatter.

Slingster,

just for fun, I ran the 416 Z thru quickload and got 58,000 psi for the 350g bullet and 51,000 psi for the 400g Hawk with about 10% less recoil than an equivalent 404 J. And loading density almost 100% for the Hawk.

steve

actually, the 376 fits PERFECTLY into a short action, that being defined as a rifle that was designed to shoot 7x57.

It's right at 3.100 with anything (except 300s) right on the crimp line.

I bult mine on a mexican 36 mauser... with nothing but a little ramp work and a touch to the sides...

jeffe