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Thread: 6ppc load help?

  1. #16
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    Which one

    Quote Originally Posted by Lee Martin View Post
    Don't worry about tuning with neck tension. I'd probably do 0.002" with H322 and then tinker with seating depth and charge. Take a practice target and make each row a given weight of powder. Jam the bullet, shoot a 2 or 3 shot group, and seat back in 0.003" - 0.005" increments. Then up your charge 0.3 grs and move to the next row again using jam as the starting point.

    Illustrated (in this case I did jam+5 back to jam - 10):



    You'll quickly find what the gun likes. And as suggested, always shoot over flags.

    -Lee
    www.singleactions.com
    So which load did you pick on that target? I am New and still learning, thanks

  2. #17
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    Quote Originally Posted by ttfreestyle View Post
    So which load did you pick on that target? I am New and still learning, thanks
    I'm gonna' venture a guess that he started working with 28.3

    LOL

    al

  3. #18
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    If you look at the entire top row, you will see that soft seating (seating longer than jam and letting the bullet be seated to final length as the round is chambered) produced excellent accuracy across the entire range of charge weights. This is a very good example of the importance of seating depth to load tuning. So often I read of shooters spending most of their time exploring charge weight almost to the exclusion of seating depth. This target demonstrates a better approach. While not necessarily the case with all powder bullet combinations, in this case, the difference in tuning node width was quite striking. It looks like any of the powder charges could have won a match, but 28.3 does stand out in that it showed up well in all but one of the rows.
    Last edited by Boyd Allen; 08-10-2016 at 08:07 AM.

  4. #19
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    Boyd is right. Jam +5 is just seating 0.005" longer than the jam length. The bullet is pushed back 5-thou upon chambering. This Shilen combined with my 67 gr FB seem to like that depth across a range of charges (264 chamber, brass turned 0.0095", 0.0015" neck tension, 0.0015" neck clearance). I've been shooting both 27.7 and 28.3 exclusively at jam + 5 with good results. One caveat though. When the humidity is low, say under 60%, the gun aggs better with 28.3. When the humidity rises much above 70% it wants the lower 27.7 node. I'm still learning LT-32 but believe it can shoot in wet air.

    -Lee
    www.singleactions.com

  5. #20
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    Quote Originally Posted by Lee Martin View Post
    Boyd is right. Jam +5 is just seating 0.005" longer than the jam length. The bullet is pushed back 5-thou upon chambering.
    It sounds like "Jam + 5" is essentially shooting at "Jam"; thus, I wonder why the top row looks so much better than the second row.

  6. #21
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    I can't explain it. It seems the bullet likes an extra 5-thou of engraving. Incidentally I have shot straight jam at 27.7 and 28.3 and the groups were considerably tighter than shown above...but still not as good as jam +5.

    -Lee
    www.singleactions.com

  7. #22
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    Perhaps being pushed back .005 as the round is chambered does a better job of centering and squaring the bullets to the bore. Sometimes we don't know exactly why a thing does or does not work, but that does not prevent us from taking advantage of the knowledge that it does.

  8. #23
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    Quote Originally Posted by Lee Martin View Post
    Boyd is right. Jam +5 is just seating 0.005" longer than the jam length. The bullet is pushed back 5-thou upon chambering. This Shilen combined with my 67 gr FB seem to like that depth across a range of charges (264 chamber, brass turned 0.0095", 0.0015" neck tension, 0.0015" neck clearance). I've been shooting both 27.7 and 28.3 exclusively at jam + 5 with good results. One caveat though. When the humidity is low, say under 60%, the gun aggs better with 28.3. When the humidity rises much above 70% it wants the lower 27.7 node. I'm still learning LT-32 but believe it can shoot in wet air.

    -Lee
    www.singleactions.com
    So, when the air is denser, lower velocity is better for this combo?

  9. #24
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    Quote Originally Posted by Boyd Allen View Post
    If you look at the entire top row, you will see that soft seating (seating longer than jam and letting the bullet be seated to final length as the round is chambered) produced excellent accuracy across the entire range of charge weights. This is a very good example of the importance of seating depth to load tuning. So often I read of shooters spending most of their time exploring charge weight almost to the exclusion of seating depth. This target demonstrates a better approach. While not necessarily the case with all powder bullet combinations, in this case, the difference in tuning node width was quite striking. It looks like any of the powder charges could have won a match, but 28.3 does stand out in that it showed up well in all but one of the rows.
    Boyd you used the term "soft seating" above. Would neck tension play a greater role when you do this? In other words, might you use less neck tension in these circumstances.? Or, at this point is trial and error the modus operendi?

  10. #25
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    Quote Originally Posted by adamsgt View Post
    So, when the air is denser, lower velocity is better for this combo?
    Yes, for this combination that appears to be the case. I did click up over 28.3 in wet air and the groups couldn't match 27.7. The next node appeared to be around 28.9 grains. But it had slightly more vertical than 27.7.

    -Lee
    www.singleactions.com

  11. #26
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    Lee...if you remember, please tell us the order you shot these targets. If you have already done this just say so and I'll look. Read some stuff but can't really tell how you shot them....I'm pretty stupid.

  12. #27
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    Wilbur - I shot one charge at a time starting at jam+5 and moving down the column. I then proceeded to the next powder weight. All of this was done left to right.

    -Lee
    www.singleactions.com

  13. #28
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    Well...it looks like the seating depth matters quite a bit! Does that seating depth (+5) affect the bolt closure in any way?

  14. #29
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    Quote Originally Posted by Wilbur View Post
    Well...it looks like the seating depth matters quite a bit! Does that seating depth (+5) affect the bolt closure in any way?
    Not at all Wilbur. I'm running only 0.0015" neck tension and the bullet gets pushed back with ease. It doesn't feel any different than jump, touch, or straight jam length..

    -Lee
    www.singleactions.com

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