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Thread: IMR 4198 vs H4198? What's the difference?

  1. #21
    Boolit Buddy Old Coot's Avatar
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    Quote Originally Posted by Wardo1974 View Post
    I know it's different, I'm asking in what way. How would I use load data for IMR vs H?
    Start with the starting load, and work up slowly. Just like you would with any other powder. There is no magic in this game, but a lot of painstaking work. The LAST THING you want to do is take somebody else's load that may work in their rifle and blindly try it in yours. Every gun is different, work your loads up slowly. Then if prssures start to rise you can stop, and not ruin a fine old rifle, and maybe yourself. Brodie

  2. #22
    Boolit Master
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    A call to Hodgdon and I was told that they are the same and interchangeable. That was about six months ago and I needed to know since I have two pounds of each on hand and I load a lot for the 45-70. Trying some of each, I see no difference in groups or POI. If in doubt, call the manufacturer/owner.

  3. #23
    Boolit Master
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    Quote Originally Posted by NSB View Post
    A call to Hodgdon and I was told that they are the same and interchangeable. That was about six months ago and I needed to know since I have two pounds of each on hand and I load a lot for the 45-70. Trying some of each, I see no difference in groups or POI. If in doubt, call the manufacturer/owner.
    That probably wasn't true in 2013 when this post was started. Since then the two have become much more similar if not identical. Going to depend a lot on the vintage of the powder on hand. I think IMR 4198 has changed a bit in recent years. This is such an old post I suspect the original poster figured his question out and the answers from when the post started aren't valid today.

  4. #24
    Boolit Master
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    Originally IMR4198 was faster that H4198. Hodgdon's is now the source of both '4198' powders. They are using the name IMR4198 even though all modern manufacture powder is actually make to the formulation of the older H4198. That is so that anyone using old IMR4198 data will not get unanticipatedly higher pressures.

  5. #25
    Boolit Master
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    For my model 7 in 223 which is a bolt. IMR 4198 is its preference.

    Although in close proximity? (on burn charts)_ The difference between is minimal. So if not having one powder the other can be substituted without worry.
    Last edited by OverMax; 02-06-2019 at 12:54 PM.
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  6. #26
    Boolit Master
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    Quote Originally Posted by OverMax View Post
    For my model 7 in 223 which is a bolt. IMR 4198 is its preference.

    Although in close proximity? (on burn charts)_ IMR as far as I know is the faster burning of the two. So they are not the same. (powder)
    I'd trust Hodgdon on this one. They said they're the same, so I'm going with them.

  7. #27
    Boolit Master
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    Funny...

    Original topic & posts from back in Oct., 2013, sits for a year.... is commented on by someone in Oct 2014 like it was just yesterday from the 2013 posts, then it is now posted in 2019, just like it was yesterday & it generates more 2019 comments & the topic is still in the Smokeless Paper Patch subforum, rather than in CB Loads subforum.

    And in all those 6 years, no one has taken the time to call or email Hodgdon to find the answer from the folks who supply the powders & publish the data....

    So, folks just dicker back & forth about it.

    Go figure....


    For those who REALLY want to know the answers to the OP question(s), and get the most up to date info on the 2 powders, here is the contact webpage for Hodgdon & not only do they allow you to contact them by email on that page itself,

    https://www.hodgdon.com/company/contact-us/

    the webpage also lists the following info so you can visit them in person, write them a letter, call them, or even send them a fax...:

    Address:
    6430 Vista Drive
    Shawnee, KS 66218

    Phone:
    (913) 362-9455

    Fax:
    (913) 362-1307

    After 6 or so years & no one has actually gone to find out the real answer, I hope that those who REALLY want to know , take the time to try going to the PRODUCT SOURCE, when there is a question about a product(s), and then.... Post up your questions & what ya found out for all of us here to know. Instead of having folks just make guesses about the differences between the two powders, IF there is much of any.


    BTW, the member who originally posted the topic, Wardo1974 has not been on CB forum using that membername since June 3, 2018. I would venture to guess that he/she has figured out by now the answers to his/her question(s).

    At least I hope so...


    Posted here just to try to be a bit helpful , as well as yank the chain/ a bit to those who missed the OP original post date & still make comments to it.

    Yep... Funny.


    ETA: P.S. - I have also done it myself, which makes it just as funny when others do it too.
    LOL
    Last edited by JBinMN; 02-06-2019 at 03:33 PM.
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  8. #28
    Boolit Master
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    Check their published manuals and published data sheets.

    The phone people are not necessarily authoritative. I have gotten some wrong info from those guys.

    And because of the liability involved - powder manufacturers don't just change the formulation of cannister grade powder to one that is significantly different - they would probably discontinue it.

    Trust the info in current reloading manuals.

  9. #29
    There are burn rate charts available online that lists most all manufactures and available powders from fastest to slowest. H4198 is just a hair faster burning than the IMR equivalent, but probably not enough to be noticeable. I would be concerned with increased pressures because powders with similar burn rates can have big differences in pressures. New gun probably wouldn't matter, but older one definitely.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check