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Thread: Expansion ranges for Barnes 50 and 70 TSX

  1. #1
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    Expansion ranges for Barnes 50 and 70 TSX

    Could anyone help me out with this calculation or point me in the right direction to do it? I’d like to know the max expansion distances for both the Barnes 50 and 70 TSX rounds, specifically the improved Black Hills 50 TSX load which uses a slightly different projectile.

    The BH 50 TSX has an expansion velocity threshold of 2300 FPS.

    The Barnes 70 TSX has an expansion velocity threshold of 1800 FPS.

    Given this, I’m trying to figure out the maximum distance for expansion with the following barrel lengths:

    50 TSX (Black Hills)
    11.5”
    14.5”
    16”

    70 TSX
    11.5”
    14.5”
    16”

    Any and all help would be greatly appreciated. Trying to find the most optimal barrel length and ammo combo.

  2. #2
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    Quote Originally Posted by BallisticHarmony View Post
    Could anyone help me out with this calculation or point me in the right direction to do it? I’d like to know the max expansion distances for both the Barnes 50 and 70 TSX rounds, specifically the improved Black Hills 50 TSX load which uses a slightly different projectile.

    The BH 50 TSX has an expansion velocity threshold of 2300 FPS.

    The Barnes 70 TSX has an expansion velocity threshold of 1800 FPS.

    Given this, I’m trying to figure out the maximum distance for expansion with the following barrel lengths:

    50 TSX (Black Hills)
    11.5”
    14.5”
    16”

    70 TSX
    11.5”
    14.5”
    16”

    Any and all help would be greatly appreciated. Trying to find the most optimal barrel length and ammo combo.
    Some one of the TOD did some work ups on this. I have the spreadsheets saved. I’ll DM them to you later today/tonight.
    AQ planned for years and sent their A team to carry out the attacks, and on Flight 93 they were thwarted by a pick-up team made up of United Frequent Fliers. Many people look at 9/11 and wonder how we can stop an enemy like that. I look at FL93 and wonder, "How can we lose?". -- FromMyColdDeadHand

  3. #3
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    I can tell you some of what you can very roughly expect, but you’ll have to shoot it yourself, through your barrels to be definitive. What I have done is, downloaded a ballistic calculator, such as Ballistic AE, and found reputable internet sources for velocities. This data comes from several people and several different brand barrels.


    50 TSX 2300fps? Expansion floor
    Note that the BC on this bullet is pretty low; I got it from Barnes. Also, velocity is extremely barrel length dependent.
    10” 2759fps@muzzle 105yd limit
    11.5” 2940fps@muzzle 140yd limit
    14.5” 3250fps@muzzle 200yd limit
    16” 3268fps@muzzle 205yd limit

    62 TSX 1900fps expansion floor
    10.5” 2654fps@muzzle 270yds limit
    11.5” 2775@muzzle 300yds limit
    14.5” 2939@muzzle 350yds limit

    70 TSX 1800fps expansion floor
    10.5” 2559fps@muzzle 290yds limit
    11.5” 2649fps@muzzle 320yds limit
    14.5” 2746@muzzle 355yds limit
    16” 2788@muzzle 370yds limit

    70TSX looks best, number wise, if your barrel can spin it fast enough.

    A thread to read on this exact subject:

    https://www.m4carbine.net/showthread...defense-round&


    Some of my sources:

    https://sofrep.com/85495/suppressed-...14-5%e2%80%b3/

    https://www.m4carbine.net/showthread...s-70-Grain-TSX

    https://www.m4carbine.net/showthread...m-50-grain-TSX

    https://www.youtube.com/watch?v=0ZhuazCahMw

    https://www.youtube.com/watch?v=S3xgcu2yNRs

    I did not link any sources on LF or TOS, but I did use them.
    RLTW

  4. #4
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    Thanks so much to you both!

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