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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.
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Campfire Tracker
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Campfire Tracker
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t's likely to be in another manual. I've seen that often.
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Campfire Greenhorn
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Campfire Greenhorn
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GSPfan, Go to the ADI website: www.adi-powders.com.auThey make H4350 and it's AR2209 here. Cheers, Jack
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Close in burn rates, but not the same powder. I’m no help for 300H&H loads...
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Campfire Outfitter
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Campfire Outfitter
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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
Stupidity has its way, while its cousin, evil, runs rampant.
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Campfire Ranger
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Campfire Ranger
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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 IMR4350 is usually quite a bit more temp sensitive then H4350. Then again, H4350 is among the most temp stable rifle powders commonly available.
Casey
Not being married to any particular political party sure makes it a lot easier to look at the world more objectively... Having said that, MAGA.
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Campfire 'Bwana
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Campfire 'Bwana
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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. 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.
I try to stick with the basics, they do so well. Nothing fancy mind you, just plain jane will get it done with style. You want to see an animal drop right now? Shoot him in the ear hole. BSA MAGA
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Campfire Ranger
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Campfire Ranger
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Accurate makes a clone too. A bit further from the mark if you check the burn rate charts.
-OMotS
"If memory serves fails me..." Quote: ( unnamed) "been prtty deep in the cooler todaay " Television and radio are most effective when people question little and think even less.
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Campfire Ranger
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Campfire Ranger
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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
jwall- *** 3100 guy***
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Campfire 'Bwana
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Campfire 'Bwana
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You can look to 300 WSM data for 300 H&H Ioads.
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Campfire Regular
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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.
It's you and the bullet, and all the rest is secondary.
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Campfire Tracker
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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.
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New Member
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New Member
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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
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Campfire Kahuna
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Campfire Kahuna
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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.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
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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.
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Campfire Ranger
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Campfire Ranger
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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
"If memory serves fails me..." Quote: ( unnamed) "been prtty deep in the cooler todaay " Television and radio are most effective when people question little and think even less.
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Campfire 'Bwana
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Campfire 'Bwana
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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.
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Campfire 'Bwana
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Campfire 'Bwana
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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...
Smokeless powder carries its own oxygen.
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Campfire Tracker
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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.
Don't ask me about my military service or heroic acts...most of it is untrue.
Pronoun: Yes, SIR !
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Campfire Savant
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Campfire Savant
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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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