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Thread: Which Twist Rate

  1. #61
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    Quote Originally Posted by gotm4 View Post
    How does that study group of one 1x9 barrel shoot 77gr Sierra Matchkings suppressed? Would you risk a $1K sound suppressor on it?
    I was referring to the 69 grain Fed Gold Medal Sierra Match BTHP. Extremely effective, and like I said its a Colt Tactical 6721 its not commercial. I didn't mention "study group" just my experience with my one Colt. Like I said I have 1/7s and I would stick to a 1/7 all around, however my job uses this ammunition and I have no complaints in regard to its effectiveness and its overall performance. Different Organizations, Departments have different needs. Enough said...
    Last edited by lt211; 06-08-10 at 21:37.

  2. #62
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    I think the message was received...some just like to pick all the fly shit out of the pepper.
    "You cannot invade the mainland United States. There would be a rifle behind each blade of grass."
    Japanese Admiral Yamamoto, 1941




    "A wise man's heart directs him toward the right, but a foolish man's heart directs him toward the left."
    Ecclesiastes 10:2:

  3. #63
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    Quote Originally Posted by lt211 View Post

    . . . like I said its a Colt Tactical 6721 its not commercial . . .
    What does that mean?


    .....
    All that is necessary for trolls to flourish, is for good men to do nothing.

  4. #64
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    Quote Originally Posted by gotm4 View Post
    ...I like 1x8 for match barrels for maximum velocity with heavy 75-77gr rounds. 1x7 will work with them too but the push a little slower. ...
    If we follow the logic of the 1X8 twist for the "maximum velocity," wouldn't a 1X9 push 55 to 62 grain bullets a little faster than a 1X8 or 7? (To me it is a rhetorical question)

    Many agencies issue cartridges with 55 grain projectiles and that is all their officers are going to shoot. Applying the logic of the slower twist rate equaling more velocity, then you are increasing the distance you can get effective fragmentation/terminal ballistics from a 55 grain bullet with a 1X9 twist barrel. Some I know still use 1X12 twist barrels. They are M-16A1's on lend/lease from the Federal Government.

    I personally do not think the 1X9 twist is totally useless in the law enforcement community as long as agencies are issuing ammunition in 55 to 62 grain range.

    I am certain I will get flamed for this, but it won't be the first time. I personally use 1X8 for competition and 1X7 for defense also, but I do not believe 1X9 is useless, just less desirable to me.

  5. #65
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    Id like to know how much twist rate affects velocity granted every other aspect of the barrels are equal.

  6. #66
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    I really don't think it makes that much difference, especially with lighter projectiles. I believe there is more of a difference with heavier projectiles.

    Absent manufacturing several barrels to exacting tolerances other than twist, I think the best way we can determine the effect is to chrono ammo through a Colt 1X7 and 1X9 of the same barrel length. Unfortunately I do not a Colt AR, let alone one of each.

    I have chronographed ammo out of the different barrel lengths (6.5, 10.5, 11.5, 16, 18 and 20) I own just to build dope for each individual rifle. The barrels are of several different makes, twist rates and made from different materials, so there are more factors involved than just length.

  7. #67
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    i pretty much read everything up to this point.. i didn't see anywhere where anyone tried to put it like this.....

    a 1/9 twist barrel is not, by itself, a "useless" item. it'll kill somebuddy, even if you just use it to whack um in the head.

    but the concept fills no specific roll. there's nothing a 1/9 is best at, and it's not a "compromise" between between anything- either you need a slow twist or a fast twist, and if you only need one or the other, then you need one or the other- not a ****in 1/9.

    so, to summarize, the concept is useless.

  8. #68
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    Quote Originally Posted by az doug View Post
    If we follow the logic of the 1X8 twist for the "maximum velocity," wouldn't a 1X9 push 55 to 62 grain bullets a little faster than a 1X8 or 7? (To me it is a rhetorical question)

    Many agencies issue cartridges with 55 grain projectiles and that is all their officers are going to shoot. Applying the logic of the slower twist rate equaling more velocity, then you are increasing the distance you can get effective fragmentation/terminal ballistics from a 55 grain bullet with a 1X9 twist barrel. Some I know still use 1X12 twist barrels. They are M-16A1's on lend/lease from the Federal Government.

    I personally do not think the 1X9 twist is totally useless in the law enforcement community as long as agencies are issuing ammunition in 55 to 62 grain range.

    I am certain I will get flamed for this, but it won't be the first time. I personally use 1X8 for competition and 1X7 for defense also, but I do not believe 1X9 is useless, just less desirable to me.


    Its really a matter of perspective. If all someone is going to shoot is 55 grain ammo than it doesn't really matter.


    A PD issuing guns and ammo is a bit different than people who are buying their own stuff, and in that case there really isn't a good reason to limit ones self when the best defensive ammo is in the 70 grain range. Not that its the ONLY choice but it makes the most logical sense.

  9. #69
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    Quote Originally Posted by gotm4 View Post
    My definition of useless which is the same as Dictionary.coms definition: use·less

    –adjective
    1. of no use; not serving the purpose or any purpose; unavailing or futile: It is useless to reason with him.
    2. without useful qualities; of no practical good: a useless person; a useless gadget.
    ...

    Summary: If I can't take any of my ammo and shoot it at 200, 300, 400 or 500yds and know damn sure it'll stabilize the bullet and it'll actually fly true out to those distances or that I load up a magazine with any ammo I have on hand and shoot my SBRs with an attached sound suppressor and fire away and not have to worry about baffle strikes....If I can't do either of those things because the twist rate isn't fast enough in my barrel then that barrel is useless.
    And the definition of useful:

    Main Entry: use·ful
    Pronunciation: \ˈyüs-fəl\
    Function: adjective
    Date: 1595

    1 : capable of being put to use; especially : serviceable for an end or purpose <useful tools>


    I will agree that for your needs a 1X9 may not be of use. For me it is not desirable. I cannot agree that it is of no use when it is in fact serviceable for many and has successfully been put to good use by many.

  10. #70
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    Quote Originally Posted by Belmont31R View Post
    Its really a matter of perspective. If all someone is going to shoot is 55 grain ammo than it doesn't really matter.


    A PD issuing guns and ammo is a bit different than people who are buying their own stuff, and in that case there really isn't a good reason to limit ones self when the best defensive ammo is in the 70 grain range. Not that its the ONLY choice but it makes the most logical sense.
    I agree 100%.

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