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Barrel Length 300 win Mag

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  #8  
Unread 10-09-2010, 10:25 AM
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Re: Barrel Length 300 win Mag

I seriously doubt you'll see 100 fps loss in velocity if you go with a faster powder burn. But what you will see is a stiffer barrel (I thinking 24" barrel here), which will aid in shot repeatability. Here's something to think about; with a #7 contour barrel 26" long (that's a pretty heavy barrel) verses the same exact barrel 21", the 21" barrel is right at 2.75 times more ridgid. So in theory you shorld see a little difference just cutting the barrel off two inches. You still should see close to 3100 fps (safely) with a 180 grain bullet and a 24" barrel. I'd also say that you'll probably see close to 2950 fps with a 22" barrel and the correct powder burn, but will probably group even tighter.
gary
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  •   #9  
    Unread 10-09-2010, 03:33 PM
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    Re: Barrel Length 300 win Mag

    Thanks for the insight I did not think about the more rigid barrel that trimming down would produce. I don't like loosing FPS but that is better than accuracy. Thanks again for your thoughts
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      #10  
    Unread 10-09-2010, 06:00 PM
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    Re: Barrel Length 300 win Mag

    Quote:
    Originally Posted by BGOOD View Post
    Thanks for the insight I did not think about the more rigid barrel that trimming down would produce. I don't like loosing FPS but that is better than accuracy. Thanks again for your thoughts
    I'm in the school of thought that simply says "you gotta hit it first." A .300 Winchester is really about the max a 30 caliber will handle effieciently, and when you compair it to the .308 Norma Mag you see very little difference between the two, or better yet compair the .300 to a .300 Weatherby in 180 grain class rounds. Untill you move up to the 200+ grain bullets; there's not all that much difference. Personally I like the Norma better than the Winchester due to the longer neck, and bullet performance with heavy bullets shows up between the two case designs.

    When you opt for a shorter barrel it does change the equation quite a bit. You use different powders that tend to burn slightly faster. But on the otherhand have you ever thought about how much powder your just blowing down the barrel unburnt? Or the opposite in the idea that you burnt all the powder in the case before the bullet left the barrel? If you get similar velocity out of a 24" barrel as you did with a 26" barrel; your then left with a 26" tuning fork. But if you need the whole barrel length, then it's another story. I doubt you will see a 100 fps loss with the right kind of powder, but will rid yourself of a lot of bad harmonics going thru the barrel
    gary
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      #11  
    Unread 10-13-2010, 08:40 PM
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    Re: Barrel Length 300 win Mag

    My 300wm has a 19" barrel. I load 168 Bergers just short of 3100 fps with IMR 4350 for consistent .5 moa at any distance. It's a handy hunting rig.
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      #12  
    Unread 10-14-2010, 12:22 PM
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    Re: Barrel Length 300 win Mag

    You guys have given some great insight thank you. I think I will be making the adjustment to a 24" or even a 22" with a 2" muzzle break.

    Thanks again.
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      #13  
    Unread 01-04-2012, 08:47 AM
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    Re: Barrel Length 300 win Mag

    I know this is an old thread, but I found this article about barrel length, and it covered the .300WM.

    SWAT Article BARREL LENGTH
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      #14  
    Unread 01-04-2012, 09:19 PM
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    Re: Barrel Length 300 win Mag

    Quote:
    Originally Posted by sakoluvr View Post
    I know this is an old thread, but I found this article about barrel length, and it covered the .300WM.

    SWAT Article BARREL LENGTH
    Yes & as he stated that for hot loads with heavy bullets & slow powder, the longer barrels have an advantage with the 300 WM. But it also does a good job of explaining times when short barrels are nice, esp. with the 308.
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