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  1. #1
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    ilmbaba's Avatar
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    Questions about Barrel length, Muzzle Velocity, and Recoil Springs


    Hi Folks,

    I just received a Lone Wolf 6.61" barrel for my G21SF. I took it out to shoot today, and I had one issue and a few questions.
    I was shooting both Independence 230gr Factory Ammo, and 230 Gr LRN reloads over 4.6 gr of Bullseye.
    First off, I had no FTF, which was the most common complaint I had heard about LWD barrels. The barrel worked fine and was accurate when I was.
    The questions are:

    1. Since the Lone Wolf Barrel is 2 inches longer than the OEM Glock barrel, I am assuming that I will get higher muzzle velocity out of the LWD barrel than the Glock barrel for any given cartridge. Is there any average to use for how much faster a bullet will move in a given barrel length? (I did buy a Chrony, but it was so windy today, I din't bother messing with it). I'm guessing there is more velocity, since the gun felt like it had more recoil, and I had changed out to a SS Guide Rod and a 22# spring.

    2. In the middle of shooting the LRN cartridges, I shot one, the gun ejected and fed the next round, but the trigger did not reset. I racked the slide to put the next round in, but the trigger still did not reset. I switched back to the FMJ rounds, and no problem. Then, I shot some more lead and it happened again, but eventually went through with no more issues. Is it possible for the gun to cycle enough to eject the empty brass, feed the next round, but not reset the trigger?
    I bought the 22# spring because I am going to work up soe 45 Super loads, but i didn't change it back out for the lower power rounds. I was thinking that the longer barrel might help give the rounds enough juice to cycle the slide, and for the most part, it did.

    Any thoughts?
    Thanks.
    -Elliott
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    to save sinners, of whom I am chief.
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  2. #2
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    Otintx's Avatar
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    Isn't there another thread with a member that had failure to reset when using lead bullets ?

    I will look around but do not remember who it was or what was the problem .....


    Ot
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  3. #3
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    Someone that knows more than me will have to say but I am wondering about springs what is the factory # without knowing more I would put the factory one back to see what happens. Please post results as you get them I don't know but would guess 150- 200 more velocity at the most.
    Last edited by speednut; 05-11-2012 at 07:09 PM.

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    __jb's Avatar
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    Springs for GLOCK Semi-Auto Pistols

    The Wolff link above states that the Glock 21 comes with a 17# recoil spring...

    I wouldn't switch from the standard Glock recoil spring until it didn't work for some reason... and then, I would probably make a smaller jump than going straight to 22#...
    "While the anti-gunners seem very concerned about the "one life" that your firearm might take -- they are not very concerned about the lives it will save." Jon H. Gutmacher, Florida Firearms - Law, Use & Ownership

  5. #5
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    Elliott, The physics of ballistics are truly exacting; and true to that, measuring accurately any increase in velocity or energy requires ensuring all variables stay constant. To give you an example case length as well as wall thickness and even ensuring that cases were from the same batch so to ensure the metals were the same in makeup. Powder from the same batch as well as primers and weight ensured to be exact. Lastly projectiles, weighed, measured and seated to all the same standards. Lastly barrel cleaned thoroughly between each firing. Now all of that said as a rule of thumb you can expect about 75 fps increase for each inch after the first 2 inches. That "constant" stays true until you reach 6 inches and then it starts to decline to around 50 fps increase and contunues so until you reach 10 inches and again the velocity declines to around 20 fps of increase. To make this boring subject even more so you must remember that pistol powder versus rifle powder is in direct opposition. Handgun powders are EXTREMELY fast burning and thusly the decrease over time and distance of barrel. Conversly rifle powders are slower burning and shaped differently to ensure this slower rate of burn; thusly rifle velocities increase as barrel length increases up to 30 inches and then it becomes a wash or starts to decline. Hence the rifle barrel continues to act as the case in allowing pressure increase and projectile velocity increase.

    I'm sorry, I can't believe I just "threw up" all that just to say yep you get about 150 fps increase in your barrel change. Just have fun and put as many as you can in the same hole.
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  6. #6
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    docglock's Avatar
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    Short answer, look here for some velocities vs barrel length:

    BBTI - Ballistics by the Inch :: .45 Auto Results

  7. #7
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    ilmbaba's Avatar
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    Quote Originally Posted by OklahomaSafeShooting View Post
    I'm sorry, I can't believe I just "threw up" all that just to say yep you get about 150 fps increase in your barrel change. Just have fun and put as many as you can in the same hole.
    I'll gladly clean up after you for that answer.
    Thanks.

    JB - I went straight to the 22# spring because the idea was to start shooting 45 Super loads out of it. I hadn't made any yet, but just wanted to try the barrel. I had read that someone switched to the 22# for the same reason, but had no issues with it for regular 45 ACP either. I figured I'd just run with it (I had the stock spring with me).
    I had no issues except in the middle. I was going to set up the Chrony and start testing, but it is Mother's Day, and I'm going to bake some Tiramisu Cupcakes with my daughter for my lovely bride (if I can get the girlchild away from the TV).

    Speednut - I will post some results when I get them.

    Thanks.
    -Elliott
    __________________________________________________ ________________________
    This is a faithful saying and worthy of all acceptance, that Christ Jesus came into the world
    to save sinners, of whom I am chief.
    1 Timothy 1:15

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