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  1. #1
    Senior Member ChromeLibrarian is on a distinguished road ChromeLibrarian's Avatar
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    Default Loading data differences.

    A while back, I was given a sealed can of Ireco-85 powder, which I intended to use to load 300 win mag. There was a legendary pdf file of loading data floating around which I couldn't find, so the only loading data I had was some listed on the outside of the can, which listed the load for a 180 grain bullet as 84-86 grains. I loaded some at the light end of the scale and took them out to test.

    They were really hot, so I broke the remaining rounds down.

    So, this morning someone emailed me the pdf of data. The starting load in the pdf is a full ten grains lower than the starting load listed on the can. The max load listed on the can was listed as "blowing primers" in the pdf. This matches pretty well with my experience. No wonder my loads were hot.

    Time to try it again, using the pdf data.

  2. #2
    Super Moderator Alan R McDaniel Jr is a jewel Alan R McDaniel Jr is a jewel Alan R McDaniel Jr is a jewel
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    I found the same thing when I started loading for my 308 Norma Mag. I'm not sure why these sorts of discrepancies exist but they do and it's worth remembering when starting to work up a load in any firearm. I've got about five or six references that I check now whenever I'm doing something new. It just makes sense.

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  3. #3
    Super Awesome Moderator 220combat will become famous soon enough 220combat's Avatar
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    There are many sources fo load data, and more than one should be used to determine where load development should start. There are also mistakes, and the printed data on one source may be bad. As mentioned by another poster, this a the reason we start low, and load up looking for pressure signs.
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  4. #4
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    Exactly right. I've seen up to 3 full grain differences from one published source to another, just in handgun recipes. While I've never personally seen a 10-gr delta such as CL describes, I have frequently seen 5 to 7.

    Let's be careful out there!

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  5. #5
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    In this case, it's 10 grains out of a possible 86 grains in a magnum case. The rounds I loaded were on the low end for the only data available, which was from the manufacturer of the powder. The first round showed definite pressure signs, so I took the rest of them apart. The new data shows my rounds were within the new source's safe range, but on the upper end. Now I'll start over using the new data to work up loads.

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