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Thread: Group size vs ES/SD?

  1. #11
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    Maybe I missed it, but are you neck sizing fired cases or full length resizing them? This question may not reflect an issue. To eliminate a variable, I suggest neck sizing only. You may need to buy a neck sizing die. Another variable is neck tension. Lee makes a factory crimp die which uses a collet to crimp the bullet. The die will apply the same pressure on each case. This die and the handgun caliber factory crimp die operate differently. Anyway, I think changing powder will will provide desired results. 600 yards is a long way. That figure disqualifies me even from discussing the topic. However, I will show my ignorance and say you have the wrong rifle for 600 yard shooting.

  2. #12
    Site Supporter ccmdfd's Avatar
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    Quote Originally Posted by willie View Post
    Maybe I missed it, but are you neck sizing fired cases or full length resizing them? This question may not reflect an issue. To eliminate a variable, I suggest neck sizing only. You may need to buy a neck sizing die. Another variable is neck tension. Lee makes a factory crimp die which uses a collet to crimp the bullet. The die will apply the same pressure on each case. This die and the handgun caliber factory crimp die operate differently. Anyway, I think changing powder will will provide desired results. 600 yards is a long way. That figure disqualifies me even from discussing the topic. However, I will show my ignorance and say you have the wrong rifle for 600 yard shooting.
    So far only using brand new from the box brass from Nosler. Haven't had a chance to actually reload my once fired brass yet. Haven't been using any resizing dies on the new brass.

    Agree 600 is hell of a long shot, and highly doubt I'd ever even try that. But for typical game around here, the 280AI with the LRX is certainly capable at that distance

    Thanks

  3. #13
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    Quote Originally Posted by ccmdfd View Post
    So far only using brand new from the box brass from Nosler. Haven't had a chance to actually reload my once fired brass yet. Haven't been using any resizing dies on the new brass.

    Agree 600 is hell of a long shot, and highly doubt I'd ever even try that. But for typical game around here, the 280AI with the LRX is certainly capable at that distance

    Thanks
    One consequence of not resizing new bottleneck cases is that the neck is not sized and hence neck tension is not created. I suggest not assuming that the new brass came to you with consistent neck tension. It might vary. If so, this situation will cause velocity variation. Remember to lube the new cases before sizing and also lube the inside of the case neck. Clean this area after when finished. Keep lube off case shoulder.

  4. #14
    Site Supporter Hambo's Avatar
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    I agree with willie on new brass. I've certainly shot new, unprepped brass, but not for what you're trying to do. I'd definitely size and trim them.
    "Gunfighting is a thinking man's game. So we might want to bring thinking back into it."-MDFA

  5. #15
    Site Supporter SecondsCount's Avatar
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    70 FPS is going to be about 2" difference at 600 yards.
    -Seconds Count. Misses Don't-

  6. #16
    Member TCFD273's Avatar
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    Group size vs ES/SD?

    Only work up loads on once fired brass

    Find powder and primer combo with chosen bullet using magneto speed or lab radar. Just shoot into berm

    Find combo with largest node

    Tune the load at 600 using seating depth

    ES doesnít matter much at 600yds


    Sent from my iPhone using Tapatalk
    Last edited by TCFD273; 10-06-2023 at 09:38 PM.

  7. #17
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    I agree. Iím still 3/4 moa at 400 with worse SDs/ ESs. Shoot and map it. The impacts donít lie.

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