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7mm Dakota?

 
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  #8  
Old 02-17-2012, 01:34 PM
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Join Date: Feb 2011
Location: AZ
Posts: 185
Re: 7mm Dakota?

It is a great round and the only downside as stated is brass is spendy but the Dakota brass seems to be pretty god stuff, no Lapua but pretty durable so far.

I have been using H1000 @ 75 gr and average is 3,060 fps w/ 180 HVLD's
Also tried Retumbo and settled on 73gr but it was just under 3K fps

I had much more consistent MV with the H1000 but I am in AZ and the summer heat is a pain. I know they are both extreme powders but the H1000 seems to be more stable in very high heat. Now that my gun has just over 150 rounds down the tube I may check Retumbo again as some are loading as much as 77gr and getting 3,200 fps or more.

Here is the Berger load data all are pretty conservative but give a good starting point:

BulletPowderStart LoadApproximate Start VelocityMax Load Approximate Max Velocity Fill Ratio168 GrainH4831 SC64.5274770.0297791.5%168 GrainIMR 7828 SSC63.0276268.6300190.2%168 GrainRE 2565.5278471.1300096.5%168 GrainAA MAGPRO66.0274872.0300391.7%168 GrainRETUMBO68.0278474.0301499.4%168 GrainRamshot Magnum68.5275774.7301393.8%168 GrainVIHT N56063.5278168.9300989.2%168 GrainWW WXR63.5277068.7298190.3%(COAL - 3.330"; Barrel Length - 26")BulletPowderStart LoadApproximate Start VelocityMax Load Approximate Max Velocity Fill Ratio180 GrainH4831 SC62.5266167.8287790.5%180 GrainIMR 7828 SSC61.0267466.5290489.3%180 GrainRE-2563.5269668.9289995.5%180 GrainAA MAGPRO64.0266769.8290890.8%180 GrainRETUMBO66.0270071.7291398.3%180 GrainRamshot Magnum66.5267972.2291993.0%180 GrainVIHT N56061.5269466.7290988.1%180 GrainWW WXR61.0266166.6288489.4%
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  #9  
Old 02-17-2012, 01:39 PM
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Join Date: Feb 2011
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Re: 7mm Dakota?

Well posting the load chart looks like a mess! It should read like this when you line up the headers:

Bullet ------------------ Powder --------- Start Load --- Approximate Start Velocity -- Max Load
168 Grain -------------- H4831 SC -----------64.5 ------------------ 2747 ------------------------------70.0


Approximate Max Velocity ------------ Fill Ratio
----------------- 2977 --------------------------- 91.5%
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  #10  
Old 02-17-2012, 03:59 PM
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Join Date: Dec 2005
Location: Casper, WY
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Re: 7mm Dakota?

I am using 77 grain of Retumbo with the 168 grain Berger VLD's at 3,160 fps. I loaded up to 79 grains of Retumbo at 3,250 fps, but started to get high pressure signs and settled in on 77 grain. I will be experimenting with the 180 grain VLDs soon and hope to use Retumbo, but I will also try H1000. I get more velocity out of my Dakota (with a little less powder) than my brother does in his STW and more velocity than factory rounds out of an Ultra Mag with much less recoil.
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  #11  
Old 02-17-2012, 04:04 PM
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Re: 7mm Dakota?

RCDINAZ - Retumbo is slower burning than H1000 so you should be able to load a few more grains of Retumbo than H1000 for the same amount of pressure. If you are using 75 grain of H1000, I would think you could load at least 75 grains of Retumbo probably 76 or 77 grains.
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  #12  
Old 02-17-2012, 04:18 PM
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Join Date: Mar 2010
Location: Las Vegas, NV
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Re: 7mm Dakota?

Just had Nate Dagley, from Straight Shot Gunsmithing, build me a 7mm Dakota. Process took about 15 months or so, with barrel taking bulk of time. Defiance machine action, Bartlein barrel-5R rifling, Jewell trigger, Williams bottom metal. Accurate Innovations did stock work. Have yet to shoot it due to a hand injury, but am working up loads with 160 gr Northfork Bullets, and Swift A-frames for comparison. Folks at Dakota Arms advised that they use a lot of RL-22 in their production ammo. Plan on trying H4831Sc and Norma MRP also. Best idea is to buy a bunch of brass from Dakota as you get a bit of a discount for orders over a certain minimum. Will post some load info and accuracy stuff once I get at it. Special orderd dies from redding, but I think you can get RCBS through Dakota Arms website. Rifle is quite heavy as a result of wooden stock and #15 barrel contour but it shoud be a tack driver.
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  #13  
Old 02-17-2012, 04:35 PM
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Join Date: May 2011
Location: Stillwater Pa.
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Re: 7mm Dakota?

Thanks to everyone who has replied thus far. I appreciate all the great input. I asked a gunsmith which would he build, a 7mm stw or a 7mm rum, and his response was. Neither, if it were me it would be a 7mm dakota. I am in the process of ordering the dies and Brass (back ordered) as soon as that happens I am committed. Looking forward to more input.
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  #14  
Old 02-17-2012, 08:04 PM
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Re: 7mm Dakota?

Quote:
Originally Posted by Stumpm2 View Post
RCDINAZ - Retumbo is slower burning than H1000 so you should be able to load a few more grains of Retumbo than H1000 for the same amount of pressure. If you are using 75 grain of H1000, I would think you could load at least 75 grains of Retumbo probably 76 or 77 grains.
I ran Retumbo up that high when I started but I had better consistency with H1000. Once I got over 3K fps I was happy the extra recoil and noise were not worth another 100fps, but that is just me. I haven't check my logs but I think I had H1000 test loads up to 76.5 as well.

Load development will be on hold until I get my new 7mm RM set up. I am going to use the 168's in this gun.
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