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260 AI speed question

 
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  #8  
Old 09-11-2012, 09:38 PM
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Location: Chubbuck, Idaho
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Re: 260 AI speed question

So my question remains, would changing to a different powder like RL17 or something similar increase my speed a little? If i could reach 2900 fps I would be happy with that.
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  #9  
Old 09-12-2012, 08:55 AM
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Re: 260 AI speed question

You can get more velocity with rl17 , my buddy got 100fps more with good accuracy in his 6.5-284.
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  #10  
Old 09-12-2012, 10:14 AM
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Re: 260 AI speed question

Quote:
Originally Posted by huckjare View Post
So my question remains, would changing to a different powder like RL17 or something similar increase my speed a little? If i could reach 2900 fps I would be happy with that.

There are several powders that should increase velocity in the 260 AI.

I would look at IMR 7828, RL17, H1000.

47 Grains of IMR 7828 is a compressed load that reaches 2755 ft/sec in the standard 280. with the extra capacity of the AI you should be able to up the velocity and still be within pressure limits.

Also to increase velocity you may need to back off the lands .020 or .030 Thousandths.

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  #11  
Old 09-12-2012, 02:02 PM
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Re: 260 AI speed question

Thanks guys. That is the info I was looking for. I didn't really think to seat the bullet back. Never knew that would help increase verlocity. I'll let you know once I get a chance to get some powder and try a couple different loads.
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  #12  
Old 09-12-2012, 10:43 PM
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Re: 260 AI speed question

I use 47.5g of H4831SC in my 260ai and get 2925 with 140 Amax.
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  #13  
Old 09-12-2012, 10:45 PM
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Re: 260 AI speed question

I've been shooting 48.5 grains of H4831sc and not even topping 2900fps. Every gun is different I guess. I'm gonna try a new powder and see what happens.
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  #14  
Old 09-29-2013, 03:29 AM
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Re: 260 AI speed question

Hi Huckjare, just picked up on this dated thread re loading for a 260ai - chances are you already have your question answered by now but here's my little bit. I have a 260ai and have done considerable load devt work with mine. I (now) shoot 140gn berger VLD's exclusively as I am looking for high BC wind bucking bullets with good hunting and accuracy potential. To cut a long story short the best powder option I found ( velocity and accuracy + good case life) has been VV N560. I have tried most options and in my testing and with this bullet weight it wins hands down. I use 50.1gns in a formed case, loaded for a non compressed load and in my rifle with a 26inch tube consistently achieve 2950fps with low ES. I have heaps of data and experience with this calibre so if you have any questions ask away. It is a superb cartridge and really takes advantage of those great 6.5mm bullets without being too hard on the barrel. Cheers
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