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270 Dakota

 
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  #8  
Old 11-14-2006, 07:39 PM
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Re: 270 Dakota

From what you have stated now, I would go with a 280 AI hands down. You can get 160 gr bullets to 2950-3000 fps with a 24" barrel. Nosler is making 280 AI brass now. That would also be an advantage as you do not have to do any fire-forming. If you wanted to drop back to 150 NBTs for use on hogs and such, you should be able to get a hair under 3100 fps. Hornady makes their Interbond in a 154 gr bullet, and if that shoots well for you . . . . They also make a 154 gr SST and 162 gr AMAX. You could just buy a bunch of Hornady bullets, but I have heard some folks express concern over air pockets in the Interbonds. If that was a concern of yours, stay with the 150 gr NBTs and 160 gr NABs. Of course you can always play with the heavy SMKs or Bergers when you wanted to really strech things out.

I know it is kind of an forgotten round, but a 7 BooBoo would fit the bill. It has the capacity of the 300WM without a belt; however, you are stuck with RWS brass which is as pricey or worse than the Dakota but top-notch.
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  #9  
Old 11-14-2006, 08:06 PM
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Re: 270 Dakota

Davkrat, I thought the case head on the Dakota was larger but Barney Lawton said that he had them both in his hand and he said they were the same size. So I guess I will have to look into it further.
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  #10  
Old 11-16-2006, 12:59 PM
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Re: 270 Dakota

Does anyone have any info on a 270 Gibbs? From what I have been able to gather the GIbbs are slightly more improved than a Ackley. The shoulder is bumped forward shortening the neck. I have found info on the 30 gibbs but nothing on the 270 gibbs. Apparently the 30 Gibbs holds 7 more grains of IMR4350 than the .30-06. Using the figures in the Nosler Manual the 270 Win holds 64gr. (100%) and the 270 WBY holds 82gr. (100%) A 7 gr. increase over the 270 64gr would be 71gr which is a little less than halfway between the two. Where would the 270 AI fall?

As far as Nosler producing 280 AI brass now, can't that same brass be necked down to a 270 AI? Is the shoulder location different between the two? I know that the parent cases are 1.948 to shoulder in 270 and 1.999 in 280 but where do they land in the Ackley versions? I can't seem to find a drawing of the 270 AI. Thanks
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  #11  
Old 11-16-2006, 07:28 PM
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Re: 270 Dakota

Go to stevespages.com to check out a chamber drawing for the 270 Gibbs and AI versions. That will give you an idea of the difference. My old barber's shooting partner shoots a 270 Gibbs with a 27 or 28" barrel. He is getting 3500 fps with 130s and 3200 fps with 150s. Keep in mind these are claimed not witnessed velocities so take them with a grain of salt. I have thought about doing the Gibbs again because of the 280 AI Nosler brass. I thought that would fire-form a little better than standard 270 WW brass would. The downside to the Gibbs round is the short neck; however, if this is a hunting rifle that is probably not an issue. Keep us informed. . . .
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Old 11-16-2006, 09:19 PM
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Re: 270 Dakota

Steves Pages doesn't have the Ackley in 270 only the Gibbs. Why is having a short neck bad but acceptable in a hunting rifle?
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  #13  
Old 11-17-2006, 08:57 AM
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Re: 270 Dakota

The long neck allows you to chase the lands as you shoot out the barrel. If it is a hunting rifle, you will not be shooting out the barrel anytime soon.
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