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IMR 4350 & H4350 #15247225 09/22/20
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GSPfan Offline OP
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Whats the difference in these two powders? I assume the load data for one isn't interchangeable with the other. I'm looking at load data for a 300 H&H and H4350 is noted but not IMR 4350.

BP-B2

Re: IMR 4350 & H4350 [Re: GSPfan] #15247229 09/22/20
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t's likely to be in another manual. I've seen that often.

Re: IMR 4350 & H4350 [Re: GSPfan] #15247395 09/22/20
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GSPfan,
Go to the ADI website: www.adi-powders.com.au
They make H4350 and it's AR2209 here.
Cheers, Jack

Re: IMR 4350 & H4350 [Re: GSPfan] #15247405 09/22/20
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ckat Online Content
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Close in burn rates, but not the same powder. I’m no help for 300H&H loads...

Re: IMR 4350 & H4350 [Re: GSPfan] #15247456 09/22/20
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I seem to recall reading that one is more temperature sensitive than the other. Can't say for sure. H4350 seems to be more popular in some circles.

I've used IMR 4350 in the 6.5 CM with no issues, but haven't had the chance to do any real comparisons between the two powders.

Paul

IC-A

Re: IMR 4350 & H4350 [Re: Paul39] #15247500 09/22/20
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Originally Posted by Paul39
I seem to recall reading that one is more temperature sensitive than the other. Can't say for sure. H4350 seems to be more popular in some circles.

I've used IMR 4350 in the 6.5 CM with no issues, but haven't had the chance to do any real comparisons between the two powders.

Paul



IMR4350 is usually quite a bit more temp sensitive then H4350. Then again, H4350 is among the most temp stable rifle powders commonly available.


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Re: IMR 4350 & H4350 [Re: GSPfan] #15247520 09/22/20
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Originally Posted by GSPfan
Whats the difference in these two powders? I assume the load data for one isn't interchangeable with the other. I'm looking at load data for a 300 H&H and H4350 is noted but not IMR 4350.


What bullet are you using? I'd use H4350, if it is listed in the bullet manufactures load manual. IMR4350 is a great powder, but is more temp sensitive. I still use it because I started using it a long time ago and have found some damn good loads with it. When loading for hunting loads, I generally work up my loads in the fall or winter, so there's no issues with the temp stability issue. I've seen more than 100 fps difference with loads worked up in the winter and fired in the summer. That will cause a slight POI shift and bigger spread in group size.


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Re: IMR 4350 & H4350 [Re: GSPfan] #15247529 09/22/20
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Accurate makes a clone too.
A bit further from the mark if you check the burn rate charts.


-OMotS



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Re: IMR 4350 & H4350 [Re: ckat] #15247537 09/22/20
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Originally Posted by ckat
Close in burn rates, but not the same powder. I’m no help for 300H&H loads...



YES. I recall Mule Deer saying they are very close and they're similar to 'different lots' of the same powder.
----------------------------

They're NOT exactly the same, approach the loads AS if you changed lots of powder.

MD, correct me If I'm wrong.


Jerry


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Re: IMR 4350 & H4350 [Re: GSPfan] #15247600 09/22/20
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You can look to 300 WSM data for 300 H&H Ioads.


"In the real world, think of the 6.5 Creedmoor as the modernized/standardized/optimized version of the 6.5x55/.260." John Barsness 2019
IC-B

Re: IMR 4350 & H4350 [Re: GSPfan] #15247621 09/22/20
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All I know is the one time I used IMR4350 in my Sinclair powder measure I played hell getting consistent powder throws.

I used it because I had to. Never again.

Last edited by Puddle; 09/22/20.
Re: IMR 4350 & H4350 [Re: mathman] #15247628 09/22/20
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Originally Posted by mathman
You can look to 300 WSM data for 300 H&H Ioads.

This is what I do and have for several years now.


Never take life to seriously, after all ,no one gets out of it alive.
Re: IMR 4350 & H4350 [Re: GSPfan] #15247657 09/22/20
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H4350 has been the most accurate powder i have used and i use it for several different calibers. never used imr4350 though

Re: IMR 4350 & H4350 [Re: GSPfan] #15247727 09/22/20
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Have posted this here and there, and it's also part of Chapter 9 of the Big Book of Gun Gack II, "Different Batches of the 'Same' Powder."

For that I tested all three 4350s in the same .257 Roberts, by loading 45.0 grains of powder with the 100-grain Nosler Ballistic Tip in my Remington 722's 24" barrel. Here are the chronograph results:

IMR4350: 3083 fps
H4350: 2980 fps
A4350: 2917 fps

These were all recent batches of powder. In this test A4350 is closer to H4831 in burn-rate.

Should also comment that the results could be different with another cartridge and bullet, and also that temp-resistance can be affected both by primer choice and powder-charge compression. The primary load I've used for many years in my Mark X Mauser Whitworth .375 H&H uses a maximum (and hence very compressed) charge of IMR4350, and is VERY temp-resistant. In cartridge/bullet combinations where IMR4350 isn't compressed it can be not nearly so temp-resistant.

In this particular test A4350 was the least accurate powder--but the charge could also obviously be increased somewhat, whereupon it probably would be more accurate. Many modern powders result in better accuracy when pushed to the max.


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Re: IMR 4350 & H4350 [Re: GSPfan] #15247773 09/22/20
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I'm using a Sierra 165gr BTSP. The rifle is a Ruger #1 platform I used for a custom project. I picked the rifle up from the smith yesterday and I'm hoping to find something fairly accurate quickly as I'm leaving Monday for a Antelope and Mule Deer hunt in Wyoming. It would be nice to use the new rifle but if development of a decent load doesn't work out it's not a big deal. I'll look at some data for the 300 WSM as well.

Re: IMR 4350 & H4350 [Re: GSPfan] #15247837 09/22/20
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John,
Do you have a "feel" for the relative volume or "packing" of the three 4350s?

Just curious if the key might be on the "the amount of powder that will burn" as controlled by the available oxygen...


-OMotS



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Re: IMR 4350 & H4350 [Re: GSPfan] #15247860 09/22/20
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There was a test done where the same barrel was chambered first to 300 H&H, then to 300 WSM. In summary, they're pretty much the same cartridge in different shapes.

Hopefully Mule Deer will elaborate. Typing on this phone is distracting me from tonight's episode of Inspector Morse. grin


"In the real world, think of the 6.5 Creedmoor as the modernized/standardized/optimized version of the 6.5x55/.260." John Barsness 2019
Re: IMR 4350 & H4350 [Re: OldmanoftheSea] #15247868 09/22/20
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Originally Posted by OldmanoftheSea
John,
Do you have a "feel" for the relative volume or "packing" of the three 4350s?

Just curious if the key might be on the "the amount of powder that will burn" as controlled by the available oxygen...


Smokeless powder carries its own oxygen.


"In the real world, think of the 6.5 Creedmoor as the modernized/standardized/optimized version of the 6.5x55/.260." John Barsness 2019
Re: IMR 4350 & H4350 [Re: GSPfan] #15247952 09/22/20
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"At this point, what does it matter??"

Both are out-of-stock!

Glad I have ample supplies. Hope you do, too.


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Re: IMR 4350 & H4350 [Re: GSPfan] #15247966 09/22/20
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I’ve used the IMR 4350 a lot. I get very accurate results. I have two pounds of H 4350 to try. I need to try Reloader 22 in a few also. It does really fine in a 270 Weatherby. It’s hard to make time.

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