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  1. #1
    Gunfighter
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    W231 and HP-38 interchangability

    Ok guys I've heard Hp38 is the same as 231. Is this true? I couldn't get any 231 and got 1lb of hp38 to try in my .45acp and .380acp. Any suggestions on me being able to substitute data for one or the other?
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  2. #2
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    Re: W231 and HP-38 interchangability

    Grain for Grain... It is the same.

    Sort of like H-414/W-760 and H-110/W-296. There may be other Hodgdon/Winchester cross-breeds that correlate, but HP-38/W-231 and the other two series I listed are the only ones that I am aware of.
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  3. #3
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    Re: W231 and HP-38 interchangability

    Awesome. So I assume all I hear is correct then. I just didn't want to try without proof
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  4. #4
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    Re: W231 and HP-38 interchangability

    If they are not exactly the same powder, their burning rates are so similar as to be the same. You should have no problem substituting loading data for one to the other...following normal safe reloading practices, of course.

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  5. #5
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    Re: W231 and HP-38 interchangability

    Even more reassurance. You guys are awesome. I hope this stuff is a Lil cleaner than unique. It gets a little overwhelming at the indoor range
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  6. #6
    Tinhorn
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    Re: W231 and HP-38 interchangability

    The biggest difference you will see in the two is how HP-38 meters through your measure. It does not flow as well as 231. When you look at it you will see the difference. HP-38 hangs up in my RCBS anyway. I tried it once a long time ago and went back to 231 to stay. You may feel differently.........
    Some people are so open minded their brains fall out!

  7. #7
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    Re: W231 and HP-38 interchangability

    Mustanger, they can't flow differently.

    They are the exact same powder. This is pretty well known. It has been known for some time. Hodgdon will confirm it for you, should you doubt.

  8. #8
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    Re: W231 and HP-38 interchangability

    Same stuff!

  9. #9
    Tinhorn
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    Re: W231 and HP-38 interchangability

    Quote Originally Posted by 35remington
    Mustanger, they can't flow differently.

    They are the exact same powder. This is pretty well known. It has been known for some time. Hodgdon will confirm it for you, should you doubt.
    I stand corrected. I did not know that Hodgdon now owns and operates Winchester and IMR powders. And I did not know that sometime in the past HP38 was changed to the same ball type powder as 231. In fact, it is 231. I had to educate myself on these developments that ,according to which website you read, happened in 2006 or 2009.

    But 25yrs ago when Hodgdon was by itself, HP38 was a flake powder that was a pain to meter through the measure. Little flat discs. The flakes would jam up and not cut off clean when closing. That is my experience and that is what I shared, not knowing things had changed. It was a flake powder back then and that's why I quit using it. Looking at the old manuals you can see that the burn rate of the two was not exactly the same but so close it did not much matter except on certain loads where pressure variance got a little too wide.

    Thanks for educating me. Now I can feel comfortable buying HP38.
    Some people are so open minded their brains fall out!

  10. #10
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    Re: W231 and HP-38 interchangability

    yep it is a tiny little ball powder. crazy looking to me compared to unique like im use to. excited to try something that meters well. also picked up some H110 to try in the 44mag
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    And it all started with I sure would like one of those 30-30 rifles. I do believe my wallet is doomed


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