Sako Upward Pressure in 1979 AV

Discussion in 'Sako Medium Actions' started by Bernie’s Dad, Sep 26, 2021.

  1. Bernie’s Dad

    Bernie’s Dad Well-Known Member

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    Thank you.



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  2. Bernie’s Dad

    Bernie’s Dad Well-Known Member

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    One more Q: is your barrel floated at the tip? If not is there a bump at the tip to apply upward pressure or is it smooth ?


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  3. Old Hippie

    Old Hippie Formerly known as bloorooster

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    Maybe the phrase upward pressure has caused some confusion..somewhere. Let’s think about it in another way perhaps.
    Of all the vintage period Sako rifles I’ve hand my hands on, and disassembled, I’ve never witnessed or observed any type of hump, bump or lump at the tip of the forearm. The most I have noticed is a bit of a darkened shine or polishing at the end of the barrel channel. This shine or polishing is , I believe, from the barrel contact and is a result of time and vibration during the many shots the rifle has fired.
    This contact patch is flat and follows same cylindrical plane of the entire barrel channel. It is only a light touching contact point , no real pressure is involved. It’s not a spring loaded pressure from a raised hump or pressure ramp in the channel, and no spring type or fulcrum driven release will be felt as one loosens the action screws. It’s a vibration dampening contact area that settles or mutes the barrels harmonic vibrations and resonance, having a similar effect as the Sims Vibration Laboratory damper , a weighted rubber donut collet hickeymajig seen on some guns today. You can simulate the same by simply wrapping your hand around the barrel or pressing your thumb against it during the shot. Much like a pipe in your hand..it will only chime when you drop it free to the table top. If you hold it in your hand and tap it on the table , the chime will be dampened by the contact of your hand. Like a muted guitar string! The term upward pressure maybe should be explained better as lower barrel contact.
    Icebear touched upon harmonics earlier during this thread. Harmonics or harmonic dampening are the reason the contact of wood and steel is present.
    There will be no hump or bump found.
    Hope this helps
    Edit: Icebear’s comments on harmonics are on a different post of the same subject…my bad

    bloo
     
    Last edited: Sep 28, 2021
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  4. Bucktote

    Bucktote Well-Known Member

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    Gentlemen,
    Allow me to enter in on a scary subject!! "I think I remember" seeing a post about there being 4 pounds lift up pressure on older Sako rifle barrels at the barrel end aprox last 2". I have used those rubber like doughnuts on several rifle barrels in the past. Can't say if they helped or not with any confidence. I restocked my AV with a nicely figured stock and will float the barrel as it needs a little more wood taken out of the barrel channel at the tip end. When a person buys a rifle most do not have any idea of what takes place in the shooting, zeroing. bullet & scope selection. factory or handload selection. All these things I have learned by being allowed to become a member of this forum. I think the German way of allowing a person to hunt has a lot of merrit as a lot of study & work is required to get a hunting liscense there. I thank all of you that have been so kind as to educate an old guy. You see the average guy, is like the "China Virus" We didn't know what we didn't know!! Thank you all. B/T
     
    Last edited: Sep 28, 2021
  5. Old Hippie

    Old Hippie Formerly known as bloorooster

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    4 ounces maybe
    4 pounds of force or pressure between the forearm and the barrel, would be very obvious during disassembly. Not mention splitting the stock at the bedding/anchor points..I would never try it..ever

    edit: at least with a factory vintage stock..ever
     
    Last edited: Sep 28, 2021
  6. Bernie’s Dad

    Bernie’s Dad Well-Known Member

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    I have two Ruger No 1bs. They have humps at the tip to exert upward pressure. Some guys sand them off to float the barrel. That is why I thought Sako would have done the same. I believe Remington did something like that too. Thanks for straightening me out.

    It seemed to me that if I tap the stock and it rattles that the barrel would chatter against it during the shot and cause vertical stringing rather than dampening and that increasing the pressure a bit might help.

    Thanks for all the input.


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  7. icebear

    icebear Sako-addicted

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    In researching how to improvet the accuracy of my Ruger No. 1A, I found a very popular modification that a lot of people swear by. The forend on the Ruger is attached to a hanger that floats below the barrel. The fix is to install a metal shim at the front of the hanger to couple the hanger and the barrel and thereby dampen the vibration and reduce the amplitude of the harmonics. I think the original shim was a coin - maybe a penny or a dime. I'm planning to flatten a lead sinker in a vise, as the soft lead will conform better. You then float the wood forend completely - no contact with the barrel at all. Supposedly this is a magic fix. I haven't gotten around to trying it yet, but there were an awful lot of testimonials that it worked. Now, the 1-B has a heavier barrel and a longer and heavier forend, so the magic formula may be different for it.
     
    Last edited: Sep 29, 2021
  8. Bernie’s Dad

    Bernie’s Dad Well-Known Member

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    I read about those fixes too. I had a gunsmith install a Hicks Accurizer. Same concept. They also have long throats. Loading for my 257 1b now trying to reach the lands


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