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Thread: Ballistic chart for various barrel lengths of 5.56 and 7.62?

  1. #1
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    Ballistic chart for various barrel lengths of 5.56 and 7.62?

    Could anyone please help me construct a ballistic graph with the following barrel lengths? Id like to see how much drop and velocity loss there is for the 77 SMK and the 175 SMK.

    For the 77 SMK, I need muzzle velocities and drop from 0-800 yards for the following barrel lengths:

    11.5
    14.5
    16
    18

    I also need a line representing the maximum fragmentation threshold.

    For the 175 SMK, I need muzzle velocities and drop from 0- 800 yards for the following barrel lengths:

    14.5
    16
    20

    I also need a line representing the maximum fragmentation threshold.

    Thank you so much!

  2. #2
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    Instead of one of us trying to guess what your gun is doing and where, you should really spend the $20 or so dollars and download a ballistic app. I personally use Ballistic AE. It uses Litz’s ballistic drops and his G1 through G7 BC’s for MANY bullets and loads. It takes into account your MV, the temp, the humidity, altitude, even the barometric pressure. I have used it very successfully to get hits out to 1760 with my 6.5CM. Hits at 1K are, date I saw, pretty easy now.
    Again, I use Ballistic AE, but there are many others. Those will give you much more info than my chart for your rifle.

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    Does the 175 SMK even fragment?
    "You people have too much time on your hands." - scottryan

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    Quote Originally Posted by markm View Post
    Does the 175 SMK even fragment?
    I guess I was trying to find a 7.62 round that was equivalent to the Mk262, and I figured since the military uses both rounds it's as close as I could get. I don't plan on using either of those rounds; if I go 5.56 I'll probably use 50/70 TSX for HD and 77 TMK for long range. Haven't decided what the 7.62 rounds would be yet.

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    We shoot a TON of 175 SMKs, but I've never really though of them fragging like 77gr otms do. I have no idea.??
    "You people have too much time on your hands." - scottryan

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    Quote Originally Posted by markm View Post
    We shoot a TON of 175 SMKs, but I've never really though of them fragging like 77gr otms do. I have no idea.??
    Maybe instead of frag range, then, is there some other metric that I can use to establish a terminal effective range for 7.62? Minimum ft/lbs energy? Or is it good out to 1,000 regardless?

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    Quote Originally Posted by BallisticHarmony View Post
    Or is it good out to 1,000 regardless?
    In my opinion yes, but as Vegasshooter pointed out. A ballistic app with give you better info than me watching bullets ring the steel at 1k.
    "You people have too much time on your hands." - scottryan

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    These are just for 16" barrels and are calculated using my own metrics but will give you an idea....




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    Thank you!

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    Happy to help

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