Quantcast
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Tubb Final Finish Throat Maintenance System - What is it, does it work?

Discussion in 'Rifle Country' started by Bill_Rights, Feb 17, 2009.

Thread Status:
Not open for further replies.
  1. Bill_Rights

    Bill_Rights Member

    Joined:
    Jan 11, 2009
    Messages:
    679
    Location:
    Annandale, Virginia USA
    This throat and bore polishing system seems to consist of a special cartridge (pack of 20) that you fire in your gun and the bullet itself somehow polishes your bore. Or am I over-simplfying?

    Below is one link to it, and I'll try to cut-and-paste as much other info about the system as I can after that.

    The questions are, have any of you tried it? Did it work? How do you know it worked? Does it wear out your barrel sooner? (Probably other questions will occur to you....).

    BTW, we just recently went through some of these issues on a major thread "Stubborn Copper Fouling" at http://www.thehighroad.org/showpost.php?p=5329998&postcount=1

    http://www.midwayusa.com/viewProduct/?productnumber=939874

    Here's the copy from the Midway page:
    And here's the instructions (at least part of them; the flowchart is a graphic within a PDF and I didn't know how to post it - see the attachment for the full .PDF.)

     

    Attached Files:

  2. Win52D

    Win52D Member

    Joined:
    Jul 24, 2008
    Messages:
    63
    Location:
    AZ
    I have used it on my new Savage LRPV. I can't swear that it worked but then again I have seen some one hole groups smaller than .3" c-t-c. I'm still working out load data and battling wind. It does seem to foul a bit less and be a little easier to clean.

    I did one treatment less than 500 rounds ago. Sometime before the summer I will do a second treatment.

    As to whether it is worth it....that will take about 4-5000 rounds to determine. I don't shoot full powered loads...only as much velocity and powder as I need to reach maximum accuracy so barrel life should be a bit longer than normal.

    As to what it is...the system consists of bullets coated with abrasive. The grit you use depends on the condition of your throat and barrel. You are basically fire lapping the throat.
     
  3. pbrktrt

    pbrktrt Member

    Joined:
    Jan 15, 2008
    Messages:
    329
    i ran a box of the loaded ammo through my Vanguard 270 Win when i first got it. it did tighten up groups about 1/2 inch but the biggest change was ease of cleaning & copper fouling was almost eliminated. i'd have to give it a thumbs up.
     
  4. Gewehr98

    Gewehr98 Member

    Joined:
    Dec 24, 2002
    Messages:
    5,988
    It's firelapping.

    You can do it quick, with that kit of abrasive bullets, or you can do it slowly over the course of hundreds or thousands of rounds.

    I prefer the slow method, since barrel throats aren't a permanent thing, anyway. ;)
     
  5. matrem

    matrem Member

    Joined:
    Jul 8, 2008
    Messages:
    1,611
    Location:
    Central Ohio
    Exactly..Why do in 20 what you can get a hundred or more rounds of enjoyment from?
     
  6. Bill_Rights

    Bill_Rights Member

    Joined:
    Jan 11, 2009
    Messages:
    679
    Location:
    Annandale, Virginia USA
    Gewehr,

    You say
    I thought the throat was "of a piece" with the entire barrel. How do you change the throat out?
     
  7. Gewehr98

    Gewehr98 Member

    Joined:
    Dec 24, 2002
    Messages:
    5,988
    You're right.

    They are an integral part of the barrel.

    However, throat erosion begins with the very first round fired in a rifle barrel.

    Depending on the pressure, velocity, and overbore ratio of a given rifle round, you can see serious throat erosion in as few as a few hundred rounds fired, to absolutely nothing happening over the lifetime of either the shooter or the rifle.

    A .30-.378 Weatherby can tear its throat out in as few as a couple hundred rounds. A .22LR will go a century and a couple owners with no noticeable change. There's a whole bunch of chamberings in between, to include those noted as barrel-burners, including the .220 Swift and .264 Win Mag, among others.

    Hence my saying a barrel throat is by no means a permanent thing.

    Running abrasive-coated bullets through a new barrel seems counterproductive at best to me. You're accelerating wear and removing useful throat life. Minor surface imperfections will usually get lapped out by the normal process of shooting regular ammo, maybe a box or two. That's firelapping in the mild sense of the word.

    If the bore's that rough straight from the barrel manufacturer, then there should be a phone call made. Somebody was asleep at the gun drill and/or lathe and didn't look at the finish chamber reamer. :(

    That's not saying there's no use for the abrasive bullet firelapping technique, because I've seen some mistreated milsurps get a polishing that lessened copper fouling in their pitted and corroded bores. But I'd recommend a shoot-in for a new barrel long before I'd recommend the abrasive bullet route.
     
  8. moooose102

    moooose102 Member

    Joined:
    Oct 21, 2007
    Messages:
    3,024
    Location:
    West Michigan
    what are you trying to accomplish? i used the 50 bullet (only) kit in my 45/70. i did so because the barrel surface (rifling) was very rough and copper fouled like crazy. for me, with my intended purpose, it worked great (i could visually see the difference in the barrrel surface). it polished out the vast majority of the machine marks, and the barrel now copper fouls much less. id did improve the accuracy of the rifle a bit, but it was not like it made it into a competition 1000 yard contender. as for the throat, i really couldn't tell you. i would have to use a bore scope to be able to tell that, or at a minimum, remove the barrel.
     
  9. Bill_Rights

    Bill_Rights Member

    Joined:
    Jan 11, 2009
    Messages:
    679
    Location:
    Annandale, Virginia USA
    What is OP trying to accomplish? Does it have to be anything?

    I have a brand new rifle (.308 Win) and was trying to determine whether to try "firepolishing" (I now know) with abrasive bullets on it.

    Gewehr,

    Excellent posting! From your detailed explanation alone, I decided NOT to firepolish/firelap this new barrel.

    Moooose,

    I am breaking in a new FN FNAR 7.62x51mm/.308Win rifle. It has a factory chrome-plated bore and is supposed to shoot < 1 MoA precision. From what you and "G" say, I better shoot a few boxes through it and look at the degree of copper fouling. If the fouling is just minimal, then assume the barrel is pretty smooth and skip the abrasive bullet routine. If the fouling is really bad, especially on this type of rifle, call the factory. Thanks.
     
Thread Status:
Not open for further replies.

Share This Page