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280 AI replacement for 270 Win.

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  #57  
Unread 03-02-2010, 08:39 PM
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Re: 280 AI replacement for 270 Win.

I suspect, and I could be wrong, that RL17 is going to be most useful in those calibers that run out of case capacity before they can reach potential velocity, either because of intrusion of bullet base or just capacity. Like the 30-06, about which it has been said that it is almost impossible to stuff enough slow powder like RL22 or H4831 into and get overpressure.

I would think some others that would be good candidates would be 7-08, 308, 270 WSM, 7 WSM, 300 WSM, 30-06, 338-06 and maybe 257 Roberts. Essentially the underbore calibers that are lacking somewhat in performance.

The opposite effect would be that RL17 would be least useful in calibers that have voluminous capacity such as the 257 Weatherby, 264 win mag, 300RUM etc. Marginally useful in calibers with a good ratio of case capacity to performance possible with the powders of appropriate burn rate, like the 270, 280 Remington, 7 mag and 300 win mag.

JMHO
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  •   #58  
    Unread 03-02-2010, 09:47 PM
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    Re: 280 AI replacement for 270 Win.

    Quote:
    Quote:
    Originally Posted by woods View Post
    I suspect, and I could be wrong, that RL17 is going to be most useful in those calibers that run out of case capacity before they can reach potential velocity, either because of intrusion of bullet base or just capacity. Like the 30-06, about which it has been said that it is almost impossible to stuff enough slow powder like RL22 or H4831 into and get overpressure.

    I would think some others that would be good candidates would be 7-08, 308, 270 WSM, 7 WSM, 300 WSM, 30-06, 338-06 and maybe 257 Roberts. Essentially the underbore calibers that are lacking somewhat in performance.

    The opposite effect would be that RL17 would be least useful in calibers that have voluminous capacity such as the 257 Weatherby, 264 win mag, 300RUM etc. Marginally useful in calibers with a good ratio of case capacity to performance possible with the powders of appropriate burn rate, like the 270, 280 Remington, 7 mag and 300 win mag.

    JMHO
    From what I've seen/read, it does very well in the .06 and .08 variants and the WSM's. I tried it in the 300 RUM pushinga 180 E-Tip and it essentially tied if not very slightly out perform Retumbo and H1000. However, being a faster powder, it left a lot of space in the case, maxing out at 86 gr, which I estimate to be about 86% capacity. I've read a couple of good reports with both the 7RM and the 300 WM. I'll see what it does in my 7RM compared to Retumbo.

    And I also saw a good report of RL17 in the 375 Ruger.
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      #59  
    Unread 03-02-2010, 10:26 PM
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    Re: 280 AI replacement for 270 Win.

    Quote:
    Originally Posted by MontanaRifleman View Post
    And I also saw a good report of RL17 in the 375 Ruger.
    I'm working with it now in my new 375 Ruger and (not having any data) started low and will work up. I started at 74 gr for lack of a better starting point, hoping to hit 2600 fps or so with the 270 gr TSX and got these results

    TSX 270 RL17 74.0 3.285 2552
    TSX 270 RL17 74.5 3.285 2564
    TSX 270 RL17 75.0 3.285 2578
    TSX 270 RL17 75.5 3.285 2564
    TSX 270 RL17 76.0 3.285 2572


    At these loads the velocity essentially stayed the same which tells me I have a ways to go. So I am going to load some at 77 gr, 78 gr and 79 gr for the next range session. No telling where max is but I will be watching for pressure signs and may well end up well above these levels.

    The accuracy is there at these lower levels



    Once I get decent velocity I will either decide to continue to find max or search for the load.
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      #60  
    Unread 03-02-2010, 10:41 PM
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    Re: 280 AI replacement for 270 Win.

    Quote:
    Originally Posted by MontanaRifleman View Post
    From what I've seen/read, it does very well in the .06 and .08 variants and the WSM's. I tried it in the 300 RUM pushinga 180 E-Tip and it essentially tied if not very slightly out perform Retumbo and H1000. However, being a faster powder, it left a lot of space in the case, maxing out at 86 gr, which I estimate to be about 86% capacity. I've read a couple of good reports with both the 7RM and the 300 WM. I'll see what it does in my 7RM compared to Retumbo.

    And I also saw a good report of RL17 in the 375 Ruger.
    I'd like to see your report on this. I usually run about 66-69g of 1000 or Retumbo. What would be a good start for the miracle powder known as RL17
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      #61  
    Unread 03-02-2010, 11:57 PM
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    Join Date: May 2008
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    Re: 280 AI replacement for 270 Win.

    Quote:
    Quote:
    Originally Posted by woods View Post
    I'm working with it now in my new 375 Ruger and (not having any data) started low and will work up. I started at 74 gr for lack of a better starting point, hoping to hit 2600 fps or so with the 270 gr TSX and got these results

    TSX 270 RL17 74.0 3.285 2552
    TSX 270 RL17 74.5 3.285 2564
    TSX 270 RL17 75.0 3.285 2578
    TSX 270 RL17 75.5 3.285 2564
    TSX 270 RL17 76.0 3.285 2572


    At these loads the velocity essentially stayed the same which tells me I have a ways to go. So I am going to load some at 77 gr, 78 gr and 79 gr for the next range session. No telling where max is but I will be watching for pressure signs and may well end up well above these levels.

    The accuracy is there at these lower levels



    Once I get decent velocity I will either decide to continue to find max or search for the load.
    This gentleman is getting....

    RL-17 @ 81.5gr @ 2728 FPS
    Hornady Brass trim 2.572
    CCI 250
    Barnes TSX 300gr


    in a 20" barrel

    Alaska Outdoors Forums
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      #62  
    Unread 03-03-2010, 12:02 AM
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    Re: 280 AI replacement for 270 Win.

    Quote:
    Quote:
    Originally Posted by Limbic View Post
    I'd like to see your report on this. I usually run about 66-69g of 1000 or Retumbo. What would be a good start for the miracle powder known as RL17
    I've found RL17 to run about 1gr more than H4350. I would probably start about 56 gr with 160 ABs.
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      #63  
    Unread 03-03-2010, 12:31 AM
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    Join Date: May 2008
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    Re: 280 AI replacement for 270 Win.

    Quote:
    Quote:
    Originally Posted by MontanaRifleman View Post
    I've found RL17 to run about 1gr more than H4350. I would probably start about 56 gr with 160 ABs.
    On second thought, 54 might be a better place to start.
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