imr 4831 vs. H 4831

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luftmech

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So these both appear to be from the same company, what is the difference between the two ( burn rate ? )

My Hornady manual gives load data for the H 4831 but not the IMR 4831. I went on line and can find allot of references for the IMR in a 7 WSM, and people seem to say its their preferred powder, but there is no reference to using the Hornady bullets. It is listed as a powder for med to large magnums but the red headed step child of the 7 WSM has been left doing the laundry while the others are out dancing.

I would estimate that I can use 160 grain load data for a 162 grain SST, starting low and working up as well as 150 data for the 154 SST.

Does anyone have some experience with these bullets and powder in a 7 WSM ?
 
Check the Hodgdon website for data for this cartridge. They'll have it in the Hodgdon section and the IMR section. They have slightly different burn rates and different min max charges.
 
Not THE GOSPEL but you can use about 1-1.5grs more of the H-4831 than the IMR version...... I find RE19 very close to H4831 as well......Harold
 
If I can recall...IMR 4831 is 10% faster then H4831...reduce accordingly and work your loads up from there.Just because 2 numbers are the same between different companies( or even the same company for that matter) doesnt mean they have the same burn rate..


Edit to add...when scanning the net be real careful of reloading data you find out there. I hit one well known site,loaded up a bunch of 416 rigby and got the #### kicked out of me by above said rifle. When I compared what I found online the data was 20 % over max as to what the book said for the barnes slug I was shooting. So I compared some other calibres and using the books as compared to online data...the online data was always way over the max on 10 different cartridges. If you are using a online source like oh say hodgins,data is probably good and reliable,reduce 10% and work your way up. But any other source on the net be very wary and compare there data to a known and trusted source...just my .02 worth..
 
Yes I noticed that the " reloading forums " tend to have some pretty generous powder charges, from reliable handles such as billy bob and two fingered Luke. I had found the IMR site data but it did not list the exact bullet that I am loading for. I will use the 162 btsp data for the 162 SST. Thanx for the replies.
 
Reloading manuals are a good thing...check out the hodgdon data site and stevespages..basically a lot of data from manuals...I crossreference a lot and often from several manuals online sources etc.
 
I've been almost completely dissapointed by IMR 4831, after having tried it in about eight cartridges. For most cartridges (303 Brit, 30-06 and .375 RUM I can remember off the top of my head), I was getting a no-BS, 200 fps less than advertised velocity, which is basically unforgiveable. For some reason, I was able to get about as-advertised velocity in my .270 and 300 win mag, but only with heavy (slightly compressed) powder charges. And yes, that's using magnum primers at all times as this powder is hard to ignite properly.

If using IMR 4831, I would VERY strongly reccomend testing everything with a chrony, and NOT trusting published load data, unless you're one of the few reloaders who feels ignorance is bliss.
 
Northman999 said:
I've been almost completely dissapointed by IMR 4831, after having tried it in about eight cartridges. For most cartridges (303 Brit, 30-06 and .375 RUM I can remember off the top of my head), I was getting a no-BS, 200 fps less than advertised velocity, which is basically unforgiveable. For some reason, I was able to get about as-advertised velocity in my .270 and 300 win mag, but only with heavy (slightly compressed) powder charges. And yes, that's using magnum primers at all times as this powder is hard to ignite properly.

If using IMR 4831, I would VERY strongly reccomend testing everything with a chrony, and NOT trusting published load data, unless you're one of the few reloaders who feels ignorance is bliss.
Click to expand...

It sure is strange that you are having trouble getting good velocities with IMR 4831.
I have been getting top speeds in the 7x57 and 30-06 with this powder right along. [Yes, actual chronograph speeds, not guessed]

For example, in my M700 Classic 7x57, I get 2950 fps with the 140 Partition and a good dose of IMR 4831. [It's a compressed load, but safe]
Good results with the 180 Partition in my 30-06 using this propellant.

I think it is too slow for the 303 British, and a tad fast for the 338 RUM, so not surprised there.

I have not used it in 270, so no input there.

However, a number of years ago, I had a #1 Ruger in 300 Win Mag which gave very good velocities using IMR 4831 as well.

Regards, Eagleye.
 
I've been feeding my .270 Win 57gr of IMR4831/130gr bullet for years.Not sure of the velocity as never felt the need to chrony it .Many head of BG later including bear and moose...........Harold
 
As for the IMR...I havent had velocity issues in the cartridges Ive used it in. Nothing spectacular but good standard velocities matching or exceeding factory ammunition.

my experience - Chronied

270 win. 150 gr. bullets 2850 fps
338 WM - 225 gr. bullets 2800-2850 fps. (if I recalll correctly)
 
Eagleye said:
It sure is strange that you are having trouble getting good velocities with IMR 4831.
I have been getting top speeds in the 7x57 and 30-06 with this powder right along. [Yes, actual chronograph speeds, not guessed]

For example, in my M700 Classic 7x57, I get 2950 fps with the 140 Partition and a good dose of IMR 4831. [It's a compressed load, but safe]
Good results with the 180 Partition in my 30-06 using this propellant.

I think it is too slow for the 303 British, and a tad fast for the 338 RUM, so not surprised there.

I have not used it in 270, so no input there.

However, a number of years ago, I had a #1 Ruger in 300 Win Mag which gave very good velocities using IMR 4831 as well.

Regards, Eagleye.
Click to expand...

Dave, have you ever actually tested IMR 4831 against H4831, with everything equal, except powder?
When Hodgdon's started making new H4831, I tested it against the old war surplus H4831.
In my 270, six rounds of 60 grains of surplus H4831 with 130 grain bullets averaged 3078 over the Oehler, with an es of 33.
With everything identical, except a switch to the new cannistered H4831, five rounds averaged 2960 with an es of 45.
No wonder Hodgdon's stated the same loading data could be used for the new powder, as was given for the old.
 
Eagleye, here's my load info from 303 brit and 30-06 re IMR 4831. 375 RUM I deleted all load data and just made a note not to use any more as I was getting mostly low velocities, with the occaisional very high (dangerous) velocity. Seemed like classic ignition problems with the RUM.

Loads below are from published sources.

303 Brit

#3 Book load (2450 listed, 2225 fps actual from No4 Mk1, too slow)
Primer: CCI #250 Magnum Rifle Primer
Powder: IMR 4831 47gr (listed max is 47gr)
Bullet: Sierra Prohunter 180gr spitzer
Brass: W.W Super X

30-06
#5 Max Load (2800 fps listed, 2615 actual)
Primer: CCI #250 Magnum Rifle Primer
Powder: IMR 4831 58.0 gr (listed max is 60.0 gr)
Bullet: Speer Hot Cor 180 PSP
Brass: Federal

I'm glad this powder is working for others. Like I said, I have found it fine in .270 and 300 winmag, not that I can explain why it works for me in those cases and not others...
 
H4831 said:
Dave, have you ever actually tested IMR 4831 against H4831, with everything equal, except powder?
When Hodgdon's started making new H4831, I tested it against the old war surplus H4831.
In my 270, six rounds of 60 grains of surplus H4831 with 130 grain bullets averaged 3078 over the Oehler, with an es of 33.
With everything identical, except a switch to the new cannistered H4831, five rounds averaged 2960 with an es of 45.
No wonder Hodgdon's stated the same loading data could be used for the new powder, as was given for the old.
Click to expand...

Bruce, I never had a chance to compare, since I shot up my surpus H4831 many years ago.
I shoot H4831SC in a couple of loadings now, and it is also a bit slower, since I had to add a bit to reach target velocity in the 270.
Regards, Dave.
 
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