7mm 423 dakota wildcat

[harfman99]

Well here it goes. My Fiance took a outstanding shot anchoring a really nice South Dakota whitetail buck at 605yds this last year. She was shooting my savage 112 7rm. she loves that rifle as much as i do. Being that it is broke and very accurate she can hit and kill just about everything she shoots at. Since that she has come into her own and really wants to continue hunting long range. I have decided that it is time for me to build a rifle for her also since I am building one for her I figured I would build another for myself as well. I was looking for something that would give stw velocities and function in a standard mag action. I was really looking at the 7mm dakota for the builds until the other day was looking at dakota brass on Grafs.com and I found exactly what i was looking for. There is 423 dakota brass made by lapua for for sale @ 65cents a piece. Being a tinkerer by nature I thought this cartridge necked down would do exactly what i was looking for with a little bit of work. I know that this case will have a little more capacity than the 7 dakota. I can have a custom reamer and dies made for about the same cost as it would be to get set up for 7 dakota. I ordered 500 of these cases today and am really excited to see how exactly I am going to wildcat this case. I do know that this was a limited production run of this brass so buying 500 of these cases should get us many years of and several barrels worth of reloadings.
So what do you guys think has anyone done a wildcat on this case yet? If so case specs would be helpful.

Thanks
Chris

 

[harfman99]

Think 338 lapua mag shortened to 2.475 and necked up to .423 as the parent case. My plan is giving 20 thou of taper 35deg shoulder angle and a .325 long neck.

 

[barnesuser28]

is this similar to a shortend 375 Ruger case?

 

[harfman99]

The case is .105 shorter and .053 greater in width than the 375 ruger.

 

[bigngreen]

Sound's like a 7mm-300 Norma mag, should be quite nice with a 195 Berger gun)

 

[harfman99]

well after a year and a bunch of life happening I have finally fireformed cases. This endeavor has been an adventure to say the least. All I can say in the end that the rewards have been great. I have a cartridge that with a bunch of work is exactly how I envisioned it to be. The 7-423 Dakota came out fireformed with 99.5 gn of water capacity to the base of the neck and is fat and sexy. This I am hoping with the all the rifle work done by TS customs of Miller South Dakota. this will be one heck of a ultra longrange hunting combo.

 

[AZShooter]

Lapua brass for this price is awesome. Too bad this brass requires a larger bolt face diameter.

What action did you use?

I realize Remington opened up their standard magnum boltface to .585" for their 338 Lapua offering. I looked at one and there is very little metal left!

I also see PTG offers this size bolt face.

https://shop.pacifictoolandgauge.co...ducts_id=173&zenid=f741kj3jaeoinssqppsrv2dgf3

 

[Swamplord]

Chris
looks like we developed a similar cartridge from the same parent case from the same source at the same time !

I also use the 423 Dakota brass for my wildcats, to date I have the 6.5, 7mm, 30, 338, 375, 416 and working on a 458 and 500.... all on the excellent Lapua made 423 brass, I bought a ton of that stuff, I originally used 300 and 338 Norma mag brass, have also cut down 338 Lapua cases for the larger calibers,

the 6.5, 30 and 375 wildcats were quite an eye opener, 35 degree shoulders, longer necks than the RUM's and slightly less capacity but have easily exceeded max velocity that those cases can produce with exceptional accuracy, the 375 version is all over the 378 WBY with 320 gr CT bullets.

I have no doubt the the 7mm version will match and overtake the 7mm RUM with ease , I have mine set up to run the 195 gr and 208 gr W3PS RBT bullets and the 180 Bergers will work great also, hoping the 195 gr Bergers will be available soon !

would love to share data with ya soon as mine is up and running, I just got me an 8 twist X-Caliber barrel for developing loads and fireforming brass, and they are spinning me another one

 

[harfman99]

I used my stock savage 112 7 mag to start with. The rifle is set up like a rem without the barrel nut.

 

[harfman99]

Sawmplord I am glad to hear that I wasn't the only person working with the 423 brass. Where are you having dies made? I am going to get my reamer print and three fired cases off to hornady tomorrow. Lead time is about six weeks but just like everything else it may be much longer than that.

 

[7x57]

Swamplord

I have a bunch of 423 Dakota brass waiting to be converted. The 375 bore cartridge is what I've been looking to build from this brass. Can you give me some details on your adventure building yours? I have contacted Hornady's custom die dept. and they are requiring reamer prints and parent brass. Is this the road you took? I have a couple actions sitting around, and one is waiting to be barreled in the 375/423. Thanks.

Walt

 

[Swamplord]

The 375 bore cartridge is what I've been looking to build from this brass. Can you give me some details on your adventure building yours?

Walt

Some info here, http://www.longrangehunting.com/forums/f19/375-norma-127219/index2.html

There wasn't much interest in this wildcat from members here on LRH so I quit updating on it and my other big boys...

sometimes it feels like this site is becoming sissyfied like the 24 hr campfire where they glorify pansy cartridges like the 223AI and whine that the 300 RUM "recoils too much to shoot accurately"

**** sissy hipsters anyway ...

 

[7x57]

Swamplord

You seem to have hit the nail on the head with the 375 PRO. I looked at your previous threads on the 375/423 Dakota and was impressed. You put a lot into it and the other calibers. This is the cartridge/rifle I've been looking to build. If you are interested in selling some fired brass for the reamer & dies to be cut let me know.

Great information, and your right about most over looking calibers like this. The bullets are out there to make it a great LRH. I guess recoil is what scares most away, but with some of the amazing muzzle brakes available they can be tamed down.

 

[CHARLIEDUECE65]

So what do we need for dies to make the 338 and 375 norma from the 423 dakota brass. I also bought 500 pieces as ive been interested in these rounds for awhile.