Formula for adjusting FMJ data to plated/lead

Formula for adjusting FMJ data to plated/lead

This is a discussion on Formula for adjusting FMJ data to plated/lead within the Reloading forums, part of the Defensive Ammunition & Ballistics category; Since I'm not having luck with finding data to load 10mm Rainier (any weight I have) is it safe to use FMJ data backing off ...

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  1. #1
    Member Array ConcealedinPA's Avatar
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    Formula for adjusting FMJ data to plated/lead

    Since I'm not having luck with finding data to load 10mm Rainier (any weight I have) is it safe to use FMJ data backing off start load 5%?
    S&W M&P 9c
    S&W 1911
    Glock 20
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    Benelli m2

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  2. #2
    VIP Member Array glockman10mm's Avatar
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    You can either use the starting load data, or use 40 s&w load data.

    All you really need to do is keep it at or below 1000 fps.
    Ignorance is a long way from stupid, but left unchecked, can get there real fast.

  3. #3
    Senior Member Array FLSlim's Avatar
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    Use lead data for the same bullet if you can find it. Lyman is always a good source for loading data for lead bullets. Otherwise, using FMJ I would stay in the bottom half of the load range from your manuals. As noted by glockman10mm, to prevent case separation, I is a good idea to keep plated bullet velocities around 1000 fps or less.
    Chose a weapon that goes bang EVERY time!

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