H4350 Vs. IMR4350

Discussion in 'Reloading' started by ZSteinle, Dec 3, 2008.

  1. ZSteinle

    ZSteinle Well-Known Member

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    What is the difference in these two powders. And also currious of the difference between H4831 and IMR4831
     
  2. KRP

    KRP Well-Known Member

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    IMR4350 has larger kernels and burns slightly faster than the H4350, or the stuff I have does anyway. Same deal with the 4831 I believe although I don't have both to compare directly.
     

  3. johnnyk

    johnnyk Well-Known Member

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    Z,
    Physically, the various 4350's appear to be smaller in kernel diameter than the 4831 varieties. The IMR versions that I have are also longer kernels, however both the Hodgdon's that I have are Short Cut (SC).
    According to Lapua's Burn Chart H4350 is faster than IMR 4350 and IMR4831 is the same burn rate as H4831SC and H4831.
    According to HOdgdon's Burn Chart, IMR 4350 is faster (#91), H4350 is #92 and AA4350 is #93. I would assume they're close.
    IMR4831 is faster (#98) than H4831 and the short cut vers (#101).
    According to Reloaders Nest, AA4350 is #212, IMR4350 #213 and H4350 #217. IMR 4831 is #225 and H4831 is #232.

    This data can be confusing sometimes. The various brands (IMR,H,AA) are really close, but not interchangeable. 4831 is definately slower than 4350. JohnnyK.
     
  4. KRP

    KRP Well-Known Member

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    4831 is definately slower than 4350. What I meant was the IMR to H comparison was the same, IMR has larger kernels and is slightly faster with both powders. Reading johnnyk's response made me realize I may have added to the confusion with the wording of my earlier post.
     
  5. ZSteinle

    ZSteinle Well-Known Member

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    I have also heard that H4350 is more temperature stable and IMR4350. Has this been this case with your experience?
     
  6. Winchester 69

    Winchester 69 Well-Known Member

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    So far, this thread is best ignored.
    .
     
  7. dogdinger

    dogdinger Writers Guild

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    my experience with the H vs the IMR is that H is more consisitant.....i got a real high variation in velocities with the imr 4350 vs the h4350
     
  8. coyotelatrans

    coyotelatrans Active Member

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    I have found the H powders in the extreme line has better temp sensativity and has a lower SD than IMR powders, that doesn't mean they will give you the best accuracy over the IMR powders, they can and can't! Depends on the load and bullet used and what your gun likes. I get vary low SD with varget in a load, much lower than any IMR powder I have tried and it also gives me great accuracy! Same can be said for other H powders as far as SD. If you shoot alot durring a specific time of year than shoot what shoots the best, if you shoot alot through out the year meaning from 20 degrees- 85 degrees I have found a closer point of impact with the H powders in the extreme lineup over IMR and really over ball type powders!

    Another thing is I have a 25/06 it likes the IMR 4350 over the H 4350 as far as accuracy goes I use this mainly in the fall for big game so not a big deal with FPS changes and temps. Each lot of powder will be a little different but I believe in that extreme coating as the cronograph shows it to have some value! So if I ca get a laod to shoot well and decent fps with H powder I use it!
     
  9. hypersonic

    hypersonic Well-Known Member

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    Perhaps you could enlighten us all and then this thread won't be best ignored, thanks a bunch
     
  10. Winchester 69

    Winchester 69 Well-Known Member

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    Too much misinformation. Temperature sensitivity, kernal size and color are interesting, but confusion regarding burn rate and density (which hasn't been discussed) is dangerous. Why don't you and others recognize it?
    .
     
    Last edited: Dec 6, 2008
  11. coyotelatrans

    coyotelatrans Active Member

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    Winchester 69 I would like you to go deeper into your line of thought! I would add isn't that why we have reloading manuals? They will show guidlines for both of these powders in many loads. We must go by those who test the powders and have the equipment to do so. I will say I rarely find a accurate load at max conditions and manuals also will show load density with each given pwoder as well.

    I would say that is a good reason with the extreme line of powder less temp sensitive giving you more consistant pressure results in varying temps.

    But please continue with your line of thought on this subject maybe we can all learn new things?
     
  12. hypersonic

    hypersonic Well-Known Member

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    Thanks for suposing what I may understand or recognize or my experience with the 4350's in various cartridges. You threw up the first red flag and I thought you would expand on the thread and provide experience and information from you view point. Perhaps the word enlighten was poorly used in my prevoius post sorry for that.
     
  13. hypersonic

    hypersonic Well-Known Member

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    Thanks for suposing what I may understand or recognize or my experience with the 4350's in various cartridges. You threw up the first red flag and I thought you would expand on the thread and provide experience and information from you view point. Perhaps the word enlighten was poorly used in my prevoius post sorry for that.
     
  14. buffalorancher

    buffalorancher Writers Guild

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    My experience has only been with H4350 but I found a huge difference in a different lot. The gunsmith that built my rifle used H4350 to accuracy test and got I think 3150 FPS with a 107 gr. SMK in a 6-284. I think this powder burns too fast but I bought a 1 lb. canister in case I needed to duplicate the load. Well, I didn't find anything that shot as good as the 4350 load so I loaded some about 2 grains less than what the gunsmith used and found them to be way too hot. Heavy lift on bolt and blown primers in Lapua brass. Ended up going down something like 5 grains on powder with a load that is now 41 grains and still plenty warm with only 3075 fps. but plenty accurate. Kind of a waste to shoot this rifle so slow but it is what it is I guess. I'll only buy larger cannisters from now on.