Is IMR 4350 and H4350 the same?

B

Bustercluck

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I did a google search the other day and it seemed like there was some old threads where people were speculating that it was the same since Hogdon bought IMR. Has anybody actually done any testing to see if they're the same at different temps etc.? I know they list slightly different load data on their website, just wondering if anyone has actually compared the same load of each with the same bullet?
 
I have tested both, although close, they are not the same. In both 30-06 and 325WSM Max loads are reached about 1 grain apart in -06 and maybe 1.2 in the 325. Tested through a chronograph.
 
For my testing with 30-06, winchester brass, cci primer, and hornady 165gr sst there was .5gr difference.
57gr h4350 2835fps
56.5gr imr 4350 2845fps

Accuracy was slightly better on imr but I like the temp stability of hodgdon extreme powders.
 
They may have similar data (you could certainly use one set of data as a starting point to carefully work up a load for the other) but they are not the same powder at all. H is more temperature stable and easier to work with due to the powder sticks themselves not being the same size as firewood logs.
 
IMR made in QC.
H made in Australia.
The physical appearance is totally different, with IMR being classic long grain extruded kernels that are graphite grey in colour l. H is a shot kernel extruded powder that has a slight olive colour to it.

Burn rate is close, but no they are not the same.
 
Bustercluck said:
I did a google search the other day and it seemed like there was some old threads where people were speculating that it was the same since Hogdon bought IMR. Has anybody actually done any testing to see if they're the same at different temps etc.? I know they list slightly different load data on their website, just wondering if anyone has actually compared the same load of each with the same bullet?
Click to expand...
They are similar but have different load data. Do not use one for a substitution for the other. Similarly the same goes for I4198/H4198 and others.
 
As can be seen in this chart, the burn rates are very close, but not identical. I'm sure they could be interchanged in an emergency as long as you weren't wandering towards max loads, but they are different powders for a reason.
http://www.reloadersnest.com/burnrates.asp

I don't have any experience with 4350, but I have some pet .303 loads with i4198 and on many charts h4198 and i4198 are on the same plane or right beside each other, but I just stick with i4198. It's available so no need to poke the hornets nest.
 
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TargetAcquired said:
As can be seen in this chart, the burn rates are very close, but not identical. I'm sure they could be interchanged in an emergency as long as you weren't wandering towards max loads, but they are different powders for a reason.
http://www.reloadersnest.com/burnrates.asp

I don't have any experience with 4350, but I have some pet .303 loads with i4198 and on many charts h4198 and i4198 are on the same plane or right beside each other, but I just stick with i4198. It's available so no need to poke the hornets nest.
Click to expand...


And here is a different burn rate chart Imr4350 imr 4451 and h4350.

htt ps://www.hodgdon.com/PDF/Burn%20Rates%20-%202015-2016.pdf

Has anyone tried 4451 in 30-06??
 
hometownhero said:
And here is a different burn rate chart Imr4350 imr 4451 and h4350.

htt ps://www.hodgdon.com/PDF/Burn%20Rates%20-%202015-2016.pdf

Has anyone tried 4451 in 30-06??
Click to expand...

I have tried it in my Vanguard behind the 165 grain Ballistic Tip. 58 grains yielded 2935 fps and just under1" at 100M.

I actually liked Hybrid 100V just a bit better behind the same bullet, but the results speak for themselves.

Regards, Dave
 
Eagleye said:
I have tried it in my Vanguard behind the 165 grain Ballistic Tip. 58 grains yielded 2935 fps and just under1" at 100M.

I actually liked Hybrid 100V just a bit better behind the same bullet, but the results speak for themselves.

Regards, Dave
Click to expand...

Im using 57gr under a 165gr sst 2835 22" barrel though
 
They are two different powders and should be treated as two different powders.

There are two different powders out there(that I know of) that ARE the same powder, but they even have different load data published between the two, which means you work up a new load for each.
 
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