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Post by 72camaro on Sept 27, 2014 5:55:58 GMT -7
Is there a difference? I have some old reloading manuals and they do not have an "H" in front of 4831 in the Hodgdon manual but they do in front of their other products, like H414. I'm getting ready to reload some 160 grain Accubonds and I have some H4831, but the current load manuals are around 6 or more grains higher with the 4831 in the 1967 and the Lyman 1970 manual, that also has 4831 listed with no "H".
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Post by Timber Butte Outdoors on Sept 28, 2014 9:50:09 GMT -7
According to the Hodgdon Powder Burn Rate Chart, the IMR4831 burns a little faster than the H4831. On the chart, 1) IMR4831 is listed at 122 2) H4831 is listed at 126 out of 146 listings. Hodgdon Powder Burn Rate ChartThe chart goes from fastest to slowest. Gary |
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Post by 72camaro on Oct 6, 2014 20:05:08 GMT -7
What I was seeing was out of Hodgdon book, 4831 but the others in the book like H380 had an H in front of it. That was the same for an old Lyman book too. The IMR was not part of the equation on those loads. I've loaded H4831 for the 7mm for 64 grains with a 160 Accubond and it was fine. I don't remember for sure but I think the only numbers that share the same IMR or H is 4198? Been a while since I looked.
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Post by broper on Oct 7, 2014 7:32:52 GMT -7
The old manuals didn't have the H in front back then because nobody else besides Hodgdon had 4831. The H stands for Hodgdon. The new H 4831 might differ just a little due to improvements over the years and different lots. If you have some older H 4831 you can use the older data. But, myself, I would use one of the newer manuals with newer powder. IMR 4831 is a little faster than H 4831. I wouldn't use IMR data for H 4831 or vice versa.
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Post by 72camaro on Oct 10, 2014 7:59:48 GMT -7
Ok, that makes sense on the 4831, that no IMR was made yet and they did not need to differentiate.
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Post by broper on Oct 11, 2014 5:19:37 GMT -7
Originally 4831 was military surplus powder. Hodgdon bought it and made it available to the public. I've heard "old timers" say they bought it for 5 or 10 cents a pound. The first 4831 I use4d, I think I paid about $1.50 a lb. The good old days, huh?
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Post by 72camaro on Oct 12, 2014 9:11:33 GMT -7
That was a bit before my time, for sure, even at 1.50/lb.
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