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Thread: New BCM barrels

  1. #121
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    Quote Originally Posted by Col_Crocs View Post
    On a side note: I'm amazed by how large the Noveske's port is.
    Yeah. That's WAY TOO big. On a 14.5, I've found .080 to be a perfect balance of smooth and reliable.
    "You people have too much time on your hands." - scottryan

  2. #122
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    Could the Noveske barrel be designed for use with the Switchblock? Could that be why it's so big?

  3. #123
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    Quote Originally Posted by jackblack73 View Post
    Could the Noveske barrel be designed for use with the Switchblock? Could that be why it's so big?
    Could be. I'm not at all familiar with the switchblock...
    "You people have too much time on your hands." - scottryan

  4. #124
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    Ok, I've read the thread several times. I want a ELW 14.5 barrel (complete upper with KMR) that will see some suppressor use. Which one is better? Fluted or non fluted? The weight and cost between the two are negligible to me I just want to know if one will perform better than the other. I don't do a lot of high volume shooting so maybe it's all a moot point.

    Thanks, Sean

  5. #125
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    Quote Originally Posted by Smarcus View Post
    Ok, I've read the thread several times. I want a ELW 14.5 barrel (complete upper with KMR) that will see some suppressor use. Which one is better? Fluted or non fluted? The weight and cost between the two are negligible to me I just want to know if one will perform better than the other. I don't do a lot of high volume shooting so maybe it's all a moot point.

    Thanks, Sean
    The non fluted is stiffer than the fluted, since they're the same profile just with and without flutes. A suppressor is a significant amount of weight so I would go non fluted.

  6. #126
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    Quote Originally Posted by Phreakish View Post
    The non fluted is stiffer than the fluted, since they're the same profile just with and without flutes. A suppressor is a significant amount of weight so I would go non fluted.
    Which will have less POI shift, if any, once the barrel gets nice and hot?
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  7. #127
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    Quote Originally Posted by Phreakish View Post
    The non fluted is stiffer than the fluted, since they're the same profile just with and without flutes. A suppressor is a significant amount of weight so I would go non fluted.
    Thanks very much.

  8. #128
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    Quote Originally Posted by Zane1844 View Post
    Which will have less POI shift, if any, once the barrel gets nice and hot?
    As I mentioned, the fluted is the same profile but with flutes. As such, it will be slightly less stiff. So the fluted would be expected to shift more. The difference should be minimal, however.

  9. #129
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    Phreakish,

    Thank you very much for all the great information you've been sharing. I appreciate it.

    Could you please discuss any and all quantifiable differences in performance that exist between BCM's awaited BFH ELW barrels and BCM's "normal" BFH LW barrels?

    Thanks a lot for your time.

    Chris

  10. #130
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    Quote Originally Posted by Phreakish View Post
    1 cont: button vs hammer forged: "steel is steel" and so the expansion, all things being equal, will be about the same. That said, the cold hammer forge process creates what we call residual stress. Basically, the steel is still under pressure once it's finished. For an applied load, the actual stress of the material starts from a negative (verus zero), and therefore can take much more load prior to hitting yield. How much more is highly dependent on many variables. This is especially true for the bore, where the vast majority of the cold work, and therefore the residual stress, is retained. We effectively create a barrel that has a stronger-than-normal (even though hardness is still close to the same) liner with a considerable wall thickness. The grain of the metal will also be refined and we'd expect to see long grains (since barrel blanks start short and end long) on the surface which are tightly packed together. The impact it has on overall expansion should be minimal, and given that the residual stress state is fairly uniform from end-to-end, we wouldn't expect to see any warpage when heated versus if the profile were less than uniform. We still have the same effects from other discontinuities, but all things equal the forged barrel still has the strength advantage with the residual stresses. The tighter grain structure also gives a superior surface for applying chrome and the higher quality surface will resist corrosion better due to the tightly packed grains (similar to the corrosion inhibition seen on polished surfaces, even when untreated). These are the major benefits of the hammer forged barrels: they resist wear better due to the residual stresses and better surface finish and the hard chrome tends to lay itself down in a more uniform and dense coating which increases the benefits offered by the chrome.
    Back on page 5, I covered most all the differences.

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