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  1. Mr. Machette is offline

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    Posted On:
    1/05/2010 2:28pm

    Join us... or die
     Style: FMA, Ego Warrior

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    Quote Originally Posted by Wounded Ronin View Post
    What is headspace?
    Head space is the distance between the bolt face and the chamber.

    Too little HS, and the bolt may not slide into battery, failing to fully chamber the round. Forcing the bolt into battery under these conditions could cause unsafe pressure levels when the round detonates. Best case scenario is stuck casings. Worst case scenario is the bolt traveling through your ocular cavity at hypersonic speed.

    To much HS, and the round can literally rattle back and fourth in the chamber to the point that it may be detonated out of battery. This one is bad, because you will have no problem sliding the bolt home. So too much head space is only evident when checked with a gauge, or when given away by the condition of the spent shells. Best case scenario, bulged cases, and stuck cases tell you something is wrong, and you get it checked out. Worst case scenario, round detonates out of battery, with the resulting explosion escaping from between the bolt face and receiver, sending heavy chunks of ordinance grade steel in all sorts of horrible directions.

    Head space is checked with what they call "go / no go" guages. It's basically a couple slugs of metal, the exact thickness of the desired measurements, and the exact diameter of the round in question.

    IIRC: The "go" gauge is as thick as the minimum head space required. If the bolt doe not close on the "go" gauge, the head space it too tight. If the bolt does close, you're looking good so far, and it's time to check with the "no go" gauge.

    The "no go" gauge is slightly greater than the maximum thickness allowed for head space. You're not supposed to be able to close the bolt on this one. If the bolt does not chamber the slug, your all good! If it does, thew head space is too great, and the weapon is not safe to fire.

    A rule of thumb is to always have a gunsmith test the head space on any surplus firearm you buy. It's pretty cheap, and takes about five minutes.

    You can also buy go / no go gauges in any caliber you desire, and save yourself a little time and money that way. The price of a set is about equal to what a smith might charge you.
  2. MMA2012 is offline

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    Posted On:
    1/30/2010 12:26pm

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     Style: BJJ

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    Hell yeah! Hell no!
    I just bought a Mosin, Stripped the whole thing down to bare wood, and refinished with tung oil. Polished the whole bolt mechanism and trigger until it shined like a mirror.. Can't wait to shoot it, it looks great. Plus I free floated the barrel by sanding out the wood in around the barrel. Hopefully I can get a good MOA out of it.
  3. Jim_Jude is offline
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    Posted On:
    1/30/2010 5:40pm

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     Style: StrikeyGrappling & WW2-fu

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    Quote Originally Posted by MMA2012 View Post
    I just bought a Mosin, Stripped the whole thing down to bare wood, and refinished with tung oil. Polished the whole bolt mechanism and trigger until it shined like a mirror.. Can't wait to shoot it, it looks great. Plus I free floated the barrel by sanding out the wood in around the barrel. Hopefully I can get a good MOA out of it.
    That was probably a mistake. Most of these barrels require shims to even hit a pie pan at 200 meters (if you're lucky). Anyways... Good Luck with it.
    "Judo is a study of techniques with which you may kill if you wish to kill, injure if you wish to injure, subdue if you wish to subdue, and, when attacked, defend yourself" - Jigoro Kano (1889)
    ***Was this quote "taken out of context"?***

    "The judoist has no time to allow himself a margin for error, especially in a situation upon which his or another person's very life depends...."
    ~ The Secret of Judo (Jiichi Watanabe & Lindy Avakian), p.19

    "Hope is not a method... nor is enthusiasm."
    ~ Brigadier General Gordon Toney
  4. Wounded Ronin is offline
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    Posted On:
    1/30/2010 7:57pm

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     Style: German longsword, .45 ACP

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    In that case, then how do Zaitsev?
    “nobody shoots anybody in the face unless you’re a hit man or a video gamer.” - Jack Thompson
    http://en.wikipedia.org/wiki/Jack_Th...%28attorney%29
  5. Mr. Machette is offline

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    Posted On:
    1/31/2010 5:46pm

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    Quote Originally Posted by Jim_Jude View Post
    That was probably a mistake. Most of these barrels require shims to even hit a pie pan at 200 meters (if you're lucky). Anyways... Good Luck with it.
    What the hell kind of mosin are you shooting? (If it's an m44, they are sighted in with the bayonet extended, this means POI is way off if the bayonet is in the stowed position.)

    Most sniper kills with mosins in WWII were at 400-600 meters. This goes for both Russians and Finns. The Germans had similar statistics for their sharp shooter using the K-98.

    I had a M-39 B barrel that was free floated as part of the design. That machine will hit anything that is still close enough to see, provided your skills are up to the task.
  6. Mr. Machette is offline

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    Posted On:
    1/31/2010 5:48pm

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     Style: FMA, Ego Warrior

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    Quote Originally Posted by Wounded Ronin View Post
    In that case, then how do Zaitsev?
    **** Zaitsev, how do Simo Hayha?

    503 confirmed sniper kills in three months.

    Hathcock who?
  7. Wounded Ronin is offline
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    Posted On:
    1/31/2010 5:57pm

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     Style: German longsword, .45 ACP

    --
    Hell yeah! Hell no!
    Quote Originally Posted by Mr. Machette View Post
    **** Zaitsev, how do Simo Hayha?

    503 confirmed sniper kills in three months.

    Hathcock who?
    Hayha cheated, he also had a submachinegun.
    “nobody shoots anybody in the face unless you’re a hit man or a video gamer.” - Jack Thompson
    http://en.wikipedia.org/wiki/Jack_Th...%28attorney%29
  8. Kickapoo is offline
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    Sick double leg.

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    Posted On:
    1/31/2010 6:54pm

    supporting member
     Style: Boxing

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    Hell yeah! Hell no!
    Quote Originally Posted by Wounded Ronin View Post
    Hayha cheated, he also had a submachinegun.
    505 confirmed sniper kills, somewhere around 200 with his SMG, IIRC.
  9. Jim_Jude is offline
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    Posted On:
    1/31/2010 7:07pm

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     Style: StrikeyGrappling & WW2-fu

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    Quote Originally Posted by Mr. Machette View Post
    What the hell kind of mosin are you shooting? (If it's an m44, they are sighted in with the bayonet extended, this means POI is way off if the bayonet is in the stowed position.)

    Most sniper kills with mosins in WWII were at 400-600 meters. This goes for both Russians and Finns. The Germans had similar statistics for their sharp shooter using the K-98.

    I had a M-39 B barrel that was free floated as part of the design. That machine will hit anything that is still close enough to see, provided your skills are up to the task.
    I thought he was talking about a surplus 91/30 or something. OF COURSE sniper-grade rifles (and most any M39) will be very accurate.
    NON-sniper grade, however, is a whole different ball game.
    & I don't know why we're lumping in together half of the European theatre's arsenal...
    "Judo is a study of techniques with which you may kill if you wish to kill, injure if you wish to injure, subdue if you wish to subdue, and, when attacked, defend yourself" - Jigoro Kano (1889)
    ***Was this quote "taken out of context"?***

    "The judoist has no time to allow himself a margin for error, especially in a situation upon which his or another person's very life depends...."
    ~ The Secret of Judo (Jiichi Watanabe & Lindy Avakian), p.19

    "Hope is not a method... nor is enthusiasm."
    ~ Brigadier General Gordon Toney
  10. Jim_Jude is offline
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    Posted On:
    1/31/2010 7:16pm

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     Style: StrikeyGrappling & WW2-fu

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    Quote Originally Posted by Wounded Ronin View Post
    Hayha cheated, he also had a submachinegun.
    CHEATED!?! You're retarded. Most snipers work in teams, the spotter provides security/cover fire for the primary shooter. Simo Hayha did it all himself, with these:

    "Judo is a study of techniques with which you may kill if you wish to kill, injure if you wish to injure, subdue if you wish to subdue, and, when attacked, defend yourself" - Jigoro Kano (1889)
    ***Was this quote "taken out of context"?***

    "The judoist has no time to allow himself a margin for error, especially in a situation upon which his or another person's very life depends...."
    ~ The Secret of Judo (Jiichi Watanabe & Lindy Avakian), p.19

    "Hope is not a method... nor is enthusiasm."
    ~ Brigadier General Gordon Toney
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