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Thread: H 4198 VS IMR 4198 Powders



  1. #1
    Cowpoke
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    H 4198 VS IMR 4198 Powders

    What is the big differance between the 2 IMR 4198 vs H 4198 Besides one burns faster than the other back in the day But the new batch of IMR 4198 is new and improved since back when......... Please forgive the dumb new reloader questions

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    Deadeye
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    Not really a question of "WHICH" has or hasn't been "improved". The better question is how many times "HAVE THEY".
    WHO originally constructed, then who made for a long time, and now who makes them; are all different answers.

    One of the many reasons why lot variation is a very real thing, and why you should be mindful of it. Extruded powder has it's burning rate controlled by geometry and surface area. So if the production has shifted to a different set of equiptment, OR another supplier, it maybe slightly different than the last. Also with some of the extruded, many flavors WERE old surplus military powders. Whereas now they are newly(newer) manufactured.
    I'm a firm believer in the theory that "If it bleeds, I can kill it"

  3. #3
    Wrangler
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    Quite similar, but there is a difference.
    For example, in 444 Marlin H4198 will get about 10% more velocity.
    The IMR is easier to find around here though.
    "I have a tendency against which I should, perhaps, be on my guard, to swim against the stream..." Winston S. Churchill

    Team 444-Member #315

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    They are not interchangeable.Do not use one in substitute for the other

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    Quote Originally Posted by levernut1958 View Post
    They are not interchangeable.Do not use one in substitute for the other
    Not entirely so, but a good way to go about it, as one really should not get in the habit of substituting powders. There are so many of them that it is unnecessary to substitute. However, getting back, my 356W will accept either powder at the same charge weight. One is usually a little higher velocity and the other is usually a little more accurate. Neither attribute would spoil a hunt as it's not that much different. Now, if you were shooting for money, they are for sure not interchangeable. YMMV

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  6. #6
    Wrangler
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    Quote Originally Posted by levernut1958 View Post
    What is the big differance[?]
    Simple answer:
    They're different powders.

    They may share the same arbitrary numerical designation, but they're different powders.

  7. #7
    MZ5
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    One wonders:
    Now that Hodgy is having Thales manufacture both the IMR- and Hodgdon-branded versions of 4198, is there an ADI powder designation/number for the IMR-labeled version? If so, what is it?

    One would hope that Thales was able to duplicate the burn characteristics of the former Canadian product, but if it was me I'd be watching the Hodgy website closely for the newest data for IMR-4198.
    levernut1958 likes this.

  8. #8
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    Quote Originally Posted by MZ5 View Post
    One wonders:
    Now that Hodgy is having Thales manufacture both the IMR- and Hodgdon-branded versions of 4198, is there an ADI powder designation/number for the IMR-labeled version? If so, what is it?

    One would hope that Thales was able to duplicate the burn characteristics of the former Canadian product, but if it was me I'd be watching the Hodgy website closely for the newest data for IMR-4198.
    AR2215 is IMR4198

    AR2207 is H4198
    Darkker and MZ5 like this.

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    I've always wondered how each powder company determine the numbers.
    Look at a wolf, look at a deer, look at a human, look at a black bear. The 30-30 was designed to be the most efficient caliber to down any of them within the range you would most commonly encounter such creatures.


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