bc (Ballistic Coefficient)

Discussion in 'Free Thoughts' started by sculptor, Dec 12, 2021.

  1. sculptor Valued Senior Member

    Messages:
    8,476
    On average, the heavier the bullet the higher the bc and the harder the kickback.
    Boattail helps, but, still for the distance shot, where to draw the line between best bc and lowest kick?

    Assuming .308

    your thoughts?

    ..................................................
    I put a muzzle break on the 300 win-max, (which dropped the kickback to near the .308 but the noise increased)) but am using the .308 now
    and the deer still drop and I do not use the increased range
     
    Last edited: Dec 12, 2021
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  3. RainbowSingularity Valued Senior Member

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    as a child, i would discuss these type of subjects with my late father.

    i know very very little because i dont shoot
    but i have shot a bit
    but not for sport(not at competition level)
    i never stepped into the load your own class or got into comparing long distance stopping/killing dynamics

    im guessing you wont be changing your barrel to something different ?
    & you wont be changing your powder ?
    & you load your own ?

    so im guessing your not going to tweak your burn rate of muzzle compression of your barrel

    so your just changing the over all charge(?) & grain & projectile type ...

    that's outside my knowledge base

    i assume cross winds would make a huge difference to boattail ?
    assuming you don't need increased penetration
    at that speed & weight a brick would be sharp enough to stop the deer & any limb or bone it hits will deliver a lethal catastrophic injury & death inside a minute to 5 minutes outside chance

    you want through n through for better butchering ?

    boattail will give you longer flight in cross winds
    dropping your grain may help a tiny bit for distance & arch
    but there is only soo much physics can be tweaked
    i was picturing those muzzle fitted side exhaust discharge ports pointing slightly backwards
    maybe that would shave a tiny fraction off ?
    might add bounce but after its left the barrel ?
     
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  5. origin Heading towards oblivion Valued Senior Member

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    What's bc?
     
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  7. sculptor Valued Senior Member

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    8,476
    Ballistic Coefficient
     
  8. sculptor Valued Senior Member

    Messages:
    8,476
    yes
    greatly reduced kickback
    but lots more noise directed back at the shooter

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    must use earplugs
     
  9. Write4U Valued Senior Member

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    20,091
    243 and 308 Winchester are excellent all-purpose rounds based on the same cartridge, which is compatible with the 7.62 NATO (with careful selection).

    A 308 Winchester rifle (designed for high power loads) can handle 7.62, but the reverse is not recommended

    The 243 is just a necked down 308. That's what I call utility, for self-loaders.
     
    Last edited: Dec 12, 2021
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  10. RainbowSingularity Valued Senior Member

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    7,447
    what is you desired need/goal to achieve less kick back ?
    accuracy
    speed?(2nd/3rd round) ?
     
    Last edited: Dec 12, 2021
  11. sculptor Valued Senior Member

    Messages:
    8,476
    A few years ago, I was chatting with the local gunsmith(Pat) after getting ammo for the 300.
    He told me that after a few years, I would develop a problem from the kickback of the 300, maybe including flinching as I took the shot. It took a few years but: Pat was right, So, I bought a better pad and had him install the muzzle break.
    While he had the rifle, I bought the 308, and for a couple years switched back and forth between the 2 before settling on only using the 308.

    as re: (2nd/3rd round) ?
    No.
    I only load and fire one round--and that only after I see the target. (If you can't hit what you're aiming at---STOP SHOOTING!)
    The cataracts are getting worse----will get the new plastic lenses within 2 months, then will see if my vision will improve to where I feel more confident...?
    Also, I ain't as steady as I was 45 years ago(when I never missed at 400 meters with iron sites), and can only hold about 1 moa on most days, so don't take the long shots very often. (the vicissitudes of age)
     
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  12. RainbowSingularity Valued Senior Member

    Messages:
    7,447
    so you do not want to retard your nervous response or speed it up i assume
    but you have haptic feedback habituated nervous reaction(flinching)

    im musing here so think broadly not specifically
    nerve speed
    nerve speed slows down
    flinching starts as a delayed reaction to the recoil
    so the flinch is 2 things
    1 the delayed push back to the recoil
    the body telling the nervous system to defend

    nerve issues
    like using power tools for a while & your nerves keep vibrating

    experiments
    i would suggest stripping all metals from your diet & all calcium for maybe 3 to 5 days
    then see if your flinching is reduced on day 5 & 6 etc
    just for a test not for a new diet


    brain speed will remain the same i guess
    but everything else will probably be trying to run the same program at different speeds

    additionally
    masked pain
    masked pain from a high pain threshold & joint & bone pain can illicit subconscious reaction to defend
    you may not be registering the pain in your conscious
    only your subconscious
    but it needs fixing or adjusting.

    experiments
    have you tried having a couple of really strong coffees before you shoot to test some safe nerve accelerants ?
    coffee also accelerates the body slightly


    to more practical steps
    spreading the load so you double your stock to shoulder ratio

    the more advanced foams can have timed compression ratios
    if you have a friend in nasa you can probably get them to get you a cut off scrap of a couple of different speeds

    experiments
    you may also try some shiatsu prior to shooting

    where you use a padded club(or the palm of your hand) to gently beat your shoulder to get the tendons & muscles to tighten up pre shoot
    see how that goes
    NOT massage !
    you want compression to cause tension so everything gets in its reactive position at specified nerve speed & muscle tension(i use this in my physical training, an advanced form of shiatsu)
     
    Last edited: Dec 13, 2021

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