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Author Topic: IMR 4350 vs H4350  (Read 831 times)

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Offline anweis

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IMR 4350 vs H4350
« on: April 29, 2009, 08:48:41 AM »
I see that several powders have similar numbers and similar applications and loads. How are they different?
What is diferent between H4350 and IMR4350, for example?
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Offline skarke

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Re: IMR 4350 vs H4350
« Reply #1 on: April 29, 2009, 09:53:54 AM »
These are very similar, but not interchangeable, powders.  This question comes up from time to time, but ALWAYS refer to the repective manufacturers recommendations.  Especially since these powders are commonly used in big thumper type guns (7mm Mag, etc).
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Offline moosie

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Re: IMR 4350 vs H4350
« Reply #2 on: April 29, 2009, 11:22:53 AM »
Ditto what skarke said.  They are very similar, but not exactly the same.  Here is a good article that helps explain in greater detail.

http://findarticles.com/p/articles/mi_m0BQY/is_12_51/ai_n15736803   

moosie 
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Offline wncchester

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Re: IMR 4350 vs H4350
« Reply #3 on: April 30, 2009, 06:47:53 AM »
"What is diferent between H4350 and IMR4350, for example?"

The burn rate.
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Offline Steve P

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Re: IMR 4350 vs H4350
« Reply #4 on: April 30, 2009, 08:41:02 AM »
The manufacturor is different.

IMR 4350 is made by DuPont.
H4350 is made by Hodgdon.
AA4350 is made by Accurate Arms.

All different.  All are manufacturor attempts at duplicating the original military 4350 powder.  Not exactly the same....close....but not close enough to interchange.  You can use one in place of another, but you do HAVE to follow the book suggestion for starting loads and work you way up to your load.  You cannot interchange them.

I have some original surplus Military powder.  Not H and not IMR.  I have to use 2.0-2.5 grains more of this powder to get up to velocities I had with H.   If you were to go in reverse order and try to relace the Military powder with same charge of H or IMR powder, you would be 2.0-2.5 grains above a book load.  You can see how disasterous this could become.

Chevrolet and GMC.  Ford and Mercury.  Models can be close, but very different.

Steve :)
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Offline Lloyd Smale

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Re: IMR 4350 vs H4350
« Reply #5 on: May 01, 2009, 11:01:37 AM »
lot nos of the same powder vary as much as the brands do between imr4350 and aa4359 and h4350. For the most part there the same.
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Offline Jack Magnum

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Re: IMR 4350 vs H4350
« Reply #6 on: May 15, 2009, 07:57:57 AM »
Quote from: anweis on April 29, 2009, 08:48:41 AM
I see that several powders have similar numbers and similar applications and loads. How are they different?
What is diferent between H4350 and IMR4350, for example?
Don't know about 4350 data BUT I have a book that states Don't interchange data for IMR-4831 and H-4831 as IMR is alot faster burning rate. To confuse you further they state that IMR-4895 and H-4895 is very, very simlar in burning rates.
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Offline Halwg

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Re: IMR 4350 vs H4350
« Reply #7 on: May 15, 2009, 08:40:28 AM »
Powder is powder...I just get a can, dump it in and go shoot.  NOT!  Good way to blow up your gun and yourself.  Get a good manual and follow it, and attempt to use the same brand of powder.
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