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Thread: Advice please

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  1. #1
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    Some rough numbers from GRT:
    Maximum pressure: 63,817psi

    Your Load: : ~66,300psi
    162gr ELD-M, 3.113", 2820fps, 20", 21°C
    Last edited by Magnetite; 02-04-2022 at 08:17 AM.

  2. #2
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    Quote Originally Posted by Magnetite View Post
    Some rough numbers from GRT:
    Maximum pressure: 63,817psi

    Your Load: : ~66,300psi
    162gr ELD-M, 3.113", 2820fps, 20", 21°C
    Very sorry I was wrong it a 22” barrel, what someone mind running the numbers again with longer barrel

  3. #3
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    Updated rough numbers from GRT:
    Maximum pressure: 63,817psi

    Your Load: : ~61,860psi
    162gr ELD-M, 3.113", 2820fps, 22", 21°C
    Hunterdave likes this.

  4. #4
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    Quote Originally Posted by Magnetite View Post
    Updated rough numbers from GRT:
    Maximum pressure: 63,817psi

    Your Load: : ~61,860psi
    162gr ELD-M, 3.113", 2820fps, 22", 21°C
    So please explain how 2 inches of extra barrel drops the pressure by almost 5,000 PSI? It should be exactly the same.
    Grandpamac.

  5. #5
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    Quote Originally Posted by grandpamac View Post
    So please explain how 2 inches of extra barrel drops the pressure by almost 5,000 PSI? It should be exactly the same.
    Grandpamac.
    I’m leaving muzzle velocity constant in GRT. The longer barrel will produce the same velocity with less pressure requirement due to longer acceleration time.

    Normally the pressure would be the same for the same charge. This is all a rough estimate.

  6. #6
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    Quote Originally Posted by Magnetite View Post
    I’m leaving muzzle velocity constant in GRT. The longer barrel will produce the same velocity with less pressure requirement due to longer acceleration time.

    Normally the pressure would be the same for the same charge. This is all a rough estimate.
    Thanks Magnetite that makes sense. Out of interest what was the load of AR2209 powder used for the revised barrel length? I assume GRT will show this.
    Regards Grandpamac.

  7. #7
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    I used 53.0gr for both 20”, and 22” barrels.

 

 

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