close
Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Hunting > Long Range Hunting & Shooting

Long Range Hunting & Shooting Nightforce Optics

Reply

Shot Groups

LinkBack Thread Tools Display Modes
  #8  
Unread 08-22-2009, 03:29 PM
Platinum Member
 
Join Date: Jul 2004
Location: Texas
Posts: 6,927
Re: Shot Groups

Quote:
Originally Posted by liltank View Post
Well I think I fixed the problem. I dropped a full grain and lengthened my COL (Thanks winmagman for the reminder). What I did find, is that my Savage doesn't like a clean bore. The dirtier it got the faster it shot and the grouping stayed tight. The first shot was my comparator shot. The second after cleaning the barrel went about .25" high and .75" to the right. I decided to keep it dirty for the 3rd and 4th shot. They stacked up in the first shot and my speed increased by 50fps. Does this make sense?

Tank
Some barrels like a fouled/seasoned barrel ,if yours is one of them you may have to shoot
15 or 20 rounds and then do a light cleaning (Not back to bare metal).

Work out your cleaning regiment and then your first cold bore shot will be the one that
counts.

Most of my rifles like a fouling shot and a dry patch then I am ready to go hunting.

J E CUSTOM
__________________
"PRESS ON"
Reply With Quote
  •   #9  
    Unread 08-22-2009, 03:44 PM
    Platinum Member
     
    Join Date: Oct 2008
    Posts: 1,080
    Re: Shot Groups

    Liltank,
    Good to know you got your problem solved.
    I am picking up the tips also for my groups.
    Thanks for the teaching
    My 270 win barrel also likes a dirtier barrel.
    Reply With Quote

      #10  
    Unread 08-22-2009, 03:46 PM
    Platinum Member
     
    Join Date: Mar 2003
    Location: Southern Wisconsin
    Posts: 1,381
    Re: Shot Groups

    Quote:
    The second after cleaning the barrel went about .25" high and .75" to the right. I decided to keep it dirty for the 3rd and 4th shot. They stacked up in the first shot and my speed increased by 50fps. Does this make sense?
    I've got a couple that do the same thing. First couple of shots after cleaning register slower on the Chrony and don't shoot to the same POI as the following shots. Once the barrel fouls some, pressures build a little higher, and things settle down to where they belong.

    Chris
    __________________
    Ignorance can be treated with education, sadly there is no cure for stupidity.
    Reply With Quote
      #11  
    Unread 08-22-2009, 04:05 PM
    Platinum Member
     
    Join Date: Nov 2008
    Location: Central Pennsylvania
    Posts: 4,155
    Re: Shot Groups

    Thanks guys for the input. It help calm the nerves!!! Kids didn't help any though. The range time helped clear my head.

    Tank
    __________________
    Matthew 7:13-14
    "Enter through the narrow gate. For wide is the gate and broad is the road that leads to destruction, and many enter through it. [14] But small is the gate and narrow the road that leads to life, and only a few find it.

    If you find your self in a fair fight, your tactics suck!- Marine 1st Sergeant Jim Ryfinger

    Friends don't let friends develop canonitis!-chucknbach

    arguing over the internet is like the special Olympics....even if you win, you are still...special!
    Reply With Quote
      #12  
    Unread 08-22-2009, 09:46 PM
    Platinum Member
     
    Join Date: Dec 2008
    Location: rathdrum, id.
    Posts: 4,879
    Re: Shot Groups

    I noticed a couple of things that haven't been mentioned. Besides the fouling raising pressures, there are at least two other things that will make quite a difference in firing a string, especially in in light barrel. As the barrel heats up, the bore constricts slightly which increases pressure. Even more dramatic, which you can prove with your crono is heating the powder inside your case after it is chambered. The longer you aim, the more the pressure increases in a warm (hot) barrel. Some studies show as much or more as 1 1/2 fps for every degree in temp increase. Hope this helps. God bless.......Rich
    Reply With Quote
      #13  
    Unread 08-22-2009, 10:36 PM
    Platinum Member
     
    Join Date: Jun 2007
    Location: PUEBLO, CO, USA
    Posts: 1,126
    Re: Shot Groups

    Measuring a group to three decimal points is all a bunch of gun magazine hokus pokus. I dont care if they do make an outside micrometer to do it more accurately. You're measuring holes cut in a product that is highly changable due to thickness, dierction of grain, % moisture, temperature , etc. A 1/2" group is no more accurate than a .50" group or a .500 group. It's just like fluted barrels and the Browning barrel tuning thing hung on the end of the rifle... all hokus pokus.
    __________________
    svenska50@hotmail.com

    NRA Life Member
    Reply With Quote
      #14  
    Unread 08-23-2009, 07:05 AM
    Platinum Member
     
    Join Date: Nov 2008
    Location: Central Pennsylvania
    Posts: 4,155
    Re: Shot Groups

    Quote:
    Originally Posted by silvertip-co View Post
    Measuring a group to three decimal points is all a bunch of gun magazine hokus pokus. I dont care if they do make an outside micrometer to do it more accurately. You're measuring holes cut in a product that is highly changable due to thickness, dierction of grain, % moisture, temperature , etc. A 1/2" group is no more accurate than a .50" group or a .500 group. It's just like fluted barrels and the Browning barrel tuning thing hung on the end of the rifle... all hokus pokus.

    So how does this answer my questions? Thanks for your opinion though.

    Respectfully,
    Tank
    __________________
    Matthew 7:13-14
    "Enter through the narrow gate. For wide is the gate and broad is the road that leads to destruction, and many enter through it. [14] But small is the gate and narrow the road that leads to life, and only a few find it.

    If you find your self in a fair fight, your tactics suck!- Marine 1st Sergeant Jim Ryfinger

    Friends don't let friends develop canonitis!-chucknbach

    arguing over the internet is like the special Olympics....even if you win, you are still...special!
    Reply With Quote
    Reply

    Bookmarks

    Thread Tools
    Display Modes


    Similar Threads for: Shot Groups
    Thread Thread Starter Forum Replies Last Post
    What is the best way to measure 3 shot groups on targets Wildhog Reloading 5 03-25-2011 04:39 AM
    field shot groups caliber Long Range Hunting & Shooting 2 10-22-2010 11:29 AM
    3 shot groups with two together and one flyer? GlennRMK Reloading 7 09-07-2008 04:58 PM
    Shot groups and distances Newbie The Basics, Starting Out 2 08-10-2004 02:57 PM
    Anybody shot groups with Accubonds??? Rifles, Bullets, Barrels & Ballistics 3 07-02-2003 06:46 PM


    All times are GMT -5. The time now is 02:27 AM.


    Powered by vBulletin ©2000 - 2016, Jelsoft Enterprises Ltd.
    Content Management Powered by vBadvanced CMPS
    All content ©2010-2015 Long Range Hunting, LLC