I have a couple of ruger mk11 control feed stainless actions,I'm considering using the 330dakota case and necking it up to 458,I should get about the same velosity as the 450ackley.Has anyone used dakota brass for such a project?Any advise?Iwant to get a 400gr swift out at 2500fps-2600fps and a 450gr x at 2400-2450fps for moose and bison.

Sounds good but it looks like it would be about the same as Roy Vincents .450's. Look them up on the reloading pages.

Griz,

Art Alphin did the design work on the Dakota cartridges, most are shortened .404 Jeffery brass with sharper shoulders. That works up to .416, but above that diameter you run out of shoulder for headspace control.

The .450 Dakota is based on the Rigby size case because of this.

A careful handloader can make reloads of a .458" on the Jeffery case, but factory rifle chamber and ammunition tolerences won't hack it.

Instead, take a look at the Heavy Express lines of cartridges built on a rimless version of the .348 Winchester case.

http://www.heavyexpress.com

I have one of the .450 HE SAM rifles for testing now.

jim dodd

You would be well advised to go with a 458 Lott or something of that ilk, and give up a 100 FPS, it won't make any difference in killing power, especiall on moose and bison where a 30-06 is enough gun....

If you want more power than the Lott etc., the only way to get it is to go to a 50 cal. like the 505 Gibbs, velocity in these big bores means little after 2200 FPS..

Cross section of bullet and Sectional Density mean everything...In order to better the Lott or any 458 caliber, shoot a bullet 2.5 times its cross section at 2100 to 2400 FPS in a 505 or 500....then you will visably see a difference in killing power.

You have now entered the no spin zone.