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Thread: H4227 and IMR 4227

  1. #1
    Member alaskamace's Avatar
    Join Date
    Sep 2007

    Default H4227 and IMR 4227

    Can these be substituted for each other? I see they are next to each other on the burn chart. I have alot of .45 Colt data that uses H4227, just wondering if I could put my IMR powder to use.
    ..."Tolerance is the virtue of a man without convictions." - G.K. Chesterton

  2. #2
    Member Diesel Nut's Avatar
    Join Date
    Feb 2008
    Wasilla, AK


    I never substitute directly at max or near max loads, but part of the joy of handloading is seeing what works where. Before I owned a shelf full of reloading manuals I built a lot of loads, some standard and some wildcat, based on data from the burn-rate chart. The biggest thing to remember is start below the minimum load for the listed powder and progress slowly. For handgun cartridges if the powders are right next to each other on the chart, I usually drop 10% below minimum if I'm substituting a faster powder. If I'm substituting the slower powder I drop 5%. I think you'll be able to use the IMR just fine in your 45LC loads.

  3. #3
    Join Date
    Apr 2006
    SwampView AK, Overlooking Mt. Mckinley and Points Beyond.


    It's my understanding that it's the same stuff.

    Certainly, the Data is interchangeable.

    I can't get the Hodgdon 4227 anymore. I heard it was no longer made. I had to go with the IMR. I did notice that the Hodgdon I was using was a yellowish color, and the IMR wasn't.

    Murphy highly recommends 4227, and he oughta know.

    There are other powders that are the same, like W760 and H414, W296 and H 110, and maybe a couple more.

    Smitty of the North
    Walk Slow, and Drink a Lotta Water.
    Has it ever occurred to you, that Nothing ever occurs to God? Adrien Rodgers.
    You can't out-give God.


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