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7 dakota improved

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  #1  
Unread 02-14-2010, 10:18 AM
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7 dakota improved

Trying to decide to rebarrel my 7-330 Dakota to either a 7Dakota or improving it. Does anyone have any experience with an improved 7 Dakota ---- if so, what degree of improvement could I expect over a 7Dakota. I don't mind purchasing a custom reamer - any ideas are welcome. I already have the dakota bolt face and like the efficiency/length of all the Dakota cases, so want to stay with the 7Dakota or an improved version.
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  #2  
Unread 02-14-2010, 04:23 PM
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Re: 7 dakota improved

The main advantage of improvement would be case life, less trimming, very positive head spacing etc. As far as velocity gains go, any step up in velocity from your current case capacity, will come at the price of severly reduced throat life. Severe erosion will destroy accuracy anywhere between 150 and 600 rounds. If the latter is your goal, It would be better to put the money for a custom reamer towards a Kestrel wind meter to optimize what you already have, after all, wind is far more the enemy to LR hunting than bullet drop.
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  #3  
Unread 02-14-2010, 05:10 PM
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Re: 7 dakota improved

The Dakota case already has fairly striaght wall and not much room to push them out any farther. The walls are already about the same as an Ackley. The shoulder are 30* and could get pushed to 40*, but I dont think pushing the shoulders to 40* would gain a whole lot and IMO wouldn't be worth the effort. Load some RL17 in it and you might get another 100 fps without having to buy reamers and dies and fireforming.

-Mark
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  #4  
Unread 02-14-2010, 05:18 PM
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Re: 7 dakota improved

Quote:
Originally Posted by MontanaRifleman View Post
The Dakota case already has fairly striaght wall and not much room to push them out any farther. The walls are already about the same as an Ackley. The shoulder are 30* and could get pushed to 40*, but I dont think pushing the shoulders to 40* would gain a whole lot and IMO wouldn't be worth the effort. Load some RL17 in it and you might get another 100 fps without having to buy reamers and dies and fireforming.

-Mark
+1 on what Mark said.

Reamer and no go guages $200
Barrel $300
chambering $200
Custom dies- $200-400

For 100 fps?

BH
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  #5  
Unread 02-14-2010, 10:24 PM
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Re: 7 dakota improved

Points taken - sounds like the plain 7 dakota is the way to go. Thanks guys.
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  #6  
Unread 02-15-2010, 01:22 PM
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Re: 7 dakota improved

The 7mm Dakota case is a bit smaller in capacity than the standard 300 or 330 Dakota. About 5 or 6 grains I believe. The 7- 330 case mentioned is an Imp. 40* called the 284 STAK , same name as the poster of this thread, and holds about 9 or 10 grains more than the standard 7mm Dakota, so there is quite a difference in capacity.

The 7mm Dakota is a good round and will shoot the 180 VLDs at around 3000fps with out being IMP. ---- RHB
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  #7  
Unread 02-15-2010, 11:14 PM
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Re: 7 dakota improved

When I said that blowing out the Dakota shoulder wouldn't porvide gain a whole lot more, I was assuming he was goung back to his 7-330 Dakota. I agree that there is a significant difference between the standard 7 Dakota and the blown out 330. In anycase, if he was just looking at blowing out the 7, he would gain much. If he still has the 7-330 reamer and dies, I would just go with that if it were me. JMO.

If I wanted to do a 7 Dakota variation with or without fire forming brass, i would do it off the 300 which has a very slightly longer case at the shoulder and oeverall and doesn't need to be necked down as far, and the shoulder is 32* vs 30* The shoulder If I was getting reamer and dies made I would probably go ahead and do a 35-40* shoulder.

-Mark
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