IMR4350 vs. H4350

Discussion in 'Reloading' started by sticknstring, Mar 18, 2012.

  1. sticknstring

    sticknstring Well-Known Member

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    I have a 257 wthby that I am starting to reload for. Looking at the manuals I have, I found several IMR4350 recipes. I do not have the IMR on hand, but have a pound of H4350 on hand. To my understanding the IMR is slower than the H powder. Could I use the H that I already have safely?
     
  2. Spuds

    Spuds Well-Known Member

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  3. green 788

    green 788 Well-Known Member

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    In my experience, IMR is *faster* than H4350.

    go to Hodgdon - The Gun Powder People to find their data for both powders...

    click on "data," I think it is... you'll find it
     
  4. Mikecr

    Mikecr Well-Known Member

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    I think it all changes from lot to lot.
    So,, what does '4350' mean anyway?
     
  5. lloydsmale

    lloydsmale Well-Known Member

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    personaly id be looking at a slower powder if you want max velocitys out of the 257. At least as slow as 4831 and even that in my opinion is a bit fast.
     
  6. JackinSD

    JackinSD Well-Known Member

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    Might want to check your data. According to Hodgdon reloading data center, the 4831 will not quite reach the speeds of the 4350 in any bullet weight.

    H4350 looks like it will do just fine, in the velocity area for the range of 257 weight of bullets. There are a couple others that beat it in one or two bullet weights, but overall H4350 does pretty well.
     
  7. lloydsmale

    lloydsmale Well-Known Member

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    well jack all i can post is facts that came from actualy chonographing my loads running powders to the point that pressure signs start developing then backing off a bit. In my experience the 257 is a bit overbore for powders as fast as 4350. Also id look at the pressure that manual gives for that 4350 load then compare it to the pressure for the 4831 load and id bet there loading 4350 to a higher pressure to beat powders like 4831, 7828, re25 ect. Run those powders to the same pressure and see what you get.
     
  8. JackinSD

    JackinSD Well-Known Member

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    I'll grant you the experiece that you have.

    I am just stating the facts from Hodgdon.

    75gr vmax

    4381 Max 75.0 gr Vel. 3841 Pres. 51,900
    4350 Max 70.0 gr Vel. 3905 Pres. 51,800

    117gr Hrdy SPBT

    4381 Max 66.0 gr Vel. 3252 Pres. 52,300
    4350 Max 60.5 gr Vel. 3266 Pres. 52,000

    It is very similiar to that throughout the weight of bullets in their data.

    I am sure that different barrels will return different results.

    Actually, the one powder they did push the pressure up to show higher velocity was the 7828.

    The information I first posted was a direct comparison of 4350 vs 4831. Based on Hodgdon data.

    Both are great powders and I use them both. Grant you, not in a 257. I have found their data to be fairly close on the cartridges that I reload.

    The link to Hodgdon data is already posted in this thread if you would like to check my data.
     
  9. ovastafford

    ovastafford Well-Known Member

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    I loaded some rounds up for my brother in his .270 weatherby using Imr 7828 with 130gr accubonds! The best load out of his gun was right at max in the books, consistent .5-.75 moa out of a stock deluxe. I know its not the same cal but Id try it!
     
  10. sp6x6

    sp6x6 Well-Known Member

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    Here is how Hodgdon list burn rates,IMR-4350=113, h-4350=114,IMR-7826=132,H-1000=136. Fast to slow1-145.
     
  11. lloydsmale

    lloydsmale Well-Known Member

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    one thing you probably need to look at with that data is thats real mild pressures for the 257. Push both powders to around 57000 plus and the slower powders will leave the faster ones in there dust.
     
  12. JackinSD

    JackinSD Well-Known Member

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    Well, considering the OP only asked about the two powders above, I'll stay with my answer.
     
  13. MTBULLET

    MTBULLET Well-Known Member

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    Don;t ya just LOVE it when a guy ask's a question, then a couple "net genius" types get in a "mine's bigger than yours" Bull Crap tirade ! Just answer the guys question, as asked !

    Sorry, but I'm seein' this more and more here and don't care for it.
     
  14. JackinSD

    JackinSD Well-Known Member

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    Forums have always been about disagreement. Gives everyone more than 1 perspective.

    Your post is the type that takes things to a personal level.