Break changing POI

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by lisagrantb, Oct 11, 2013.

  1. lisagrantb

    lisagrantb Well-Known Member

    Messages:
    92
    Joined:
    Mar 20, 2008
    If you remove and reinstall your break have you noticed a change in your POI. Just currious because I removed mine for cleaning and my POI moved .5 mill. This has happened before but I thought it may have been something else. If I clean with the break on theres no POI change.
     
  2. Broz

    Broz Well-Known Member

    Messages:
    8,636
    Joined:
    Feb 3, 2007
    I prefer to leave them on. But I don't get a change in POI. I only tighten by hand and just snug it up. The mechanical forces of the threads can close down the bore dia. and will also cause coppering at the very end of the bore. Might try loosening it and reinstall only snug.

    Jeff
     

  3. HARPERC

    HARPERC Well-Known Member

    Messages:
    3,991
    Joined:
    Jan 28, 2011
    Interesting, I would not have considered that. I had a little trouble with my .338 RUM very early on, especially in the muzzle area. I'll have to pay more attention.
     
  4. Tjurgensen

    Tjurgensen Active Member

    Messages:
    37
    Joined:
    Apr 24, 2013
    If the break isn't evenly ported, just a slight change in the alignment of the ports may change how the pressure release affects the bullet. It's nothing to worry about you just need to adjust your scope accordingly.
     
  5. lisagrantb

    lisagrantb Well-Known Member

    Messages:
    92
    Joined:
    Mar 20, 2008
    Thanks for the replies, both suggestions makes sense. I usually don't take it off but I just wanted to clean everything and checck the muzzle. I think I may try putting it on using a torque wrench a couple times to see if that prevents a shift in POI.
     
  6. Broz

    Broz Well-Known Member

    Messages:
    8,636
    Joined:
    Feb 3, 2007
    One of the reasons I really like the JP brakes is the large open first port. If installed to the correct depth cleaning the muzzle and crown are an easy job even with the brake left on. I can't remember the last time I took mine off my 300 win and it gets shot and cleaned a lot.

    Jeff