close
Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Reloading

Reloading Berger Bullets

Reply

how to reduce velocity extreme spread?

LinkBack Thread Tools Display Modes
  #22  
Unread 06-15-2008, 07:31 AM
Platinum Member
 
Join Date: Oct 2007
Location: Mountians of SW NC, near Asheville
Posts: 1,595
Good - "Do you understand? You looked at accurate information, you just interpreted it wrong."

Ah. Now I understand. I guess.

You are saying that there are mulitple ways of "interpeteding" a ballistics chart and I thought I was only reading what Hornady says about drop variations at 600 yards due to 100 fps speed differences. Silly ol' me.

Okay, I don't mind saying it, you win!
Reply With Quote
  •   #23  
    Unread 10-10-2009, 06:01 PM
    Bronze Member
     
    Join Date: Feb 2008
    Posts: 83
    Re: how to reduce velocity extreme spread?

    I'm a little late chiming in here but I reloaded extensivley for a 300 Win Mag
    in a SAKO factory model 75 rifle.

    Best load was using:
    BERGER 210 seated 4 thou from rifling
    LAPUA brass, Federal 210 match Gold Medal primers,
    80.0 grains H1000
    avg 2853 fps ES 35.67 / SD 13.11
    3/8" group @ 100 yds.

    Hope this might help your situation in some way !

    Regards
    AL
    Reply With Quote

      #24  
    Unread 10-10-2009, 06:25 PM
    Platinum Member
     
    Join Date: Nov 2005
    Location: Texas
    Posts: 1,845
    Re: how to reduce velocity extreme spread?

    Just to put this to bed hopefully --- I compete at 1K won my share and will tell you that ES is CRITICAL at 1K period end of story. On a competition rifle it will make the difference between winning and not even being in the running or worse yet a DQ. On a long range hunting rifle it makes the variables that you do not have to worry about on a competition rifle become painfully obvious. Vertical dispersion is a killer.
    __________________
    The Truth Is Not Always Good For Business!!
    Reply With Quote
      #25  
    Unread 10-10-2009, 11:25 PM
    PDA PDA is offline
    Bronze Member
     
    Join Date: Apr 2009
    Posts: 63
    Re: how to reduce velocity extreme spread?

    I thought the primer could have a big effect on ES? Am I wrong? It seems so since no one has suggested trying another primer. What about a CCI250 or BR2? Someone more knowledgeable please advise.
    Reply With Quote
      #26  
    Unread 10-11-2009, 12:16 AM
    Silver Member
     
    Join Date: Oct 2006
    Location: White Mountains, AZ
    Posts: 287
    Re: how to reduce velocity extreme spread?

    Very good thread!
    __________________
    Watch your thoughts; they become words.
    Watch your words; they become actions.
    Watch your actions; they become habits.
    Watch your habits; they become character.
    Watch your character; it becomes your destiny.
    --Frank Outlaw
    Reply With Quote
      #27  
    Unread 10-11-2009, 01:16 AM
    Silver Member
     
    Join Date: Feb 2009
    Posts: 241
    Re: how to reduce velocity extreme spread?

    Just got my first chrono...Would someone please take a sec and explain ES and SD? Thanks
    Reply With Quote
      #28  
    Unread 10-11-2009, 09:10 AM
    Silver Member
     
    Join Date: Apr 2009
    Location: western Oregon
    Posts: 120
    Re: how to reduce velocity extreme spread?

    ES = Extreme spread. The maximum velocity variation with a given load.
    The highest velocity minus lowest velocity equals ES.

    SD= Standard deviation. The average velocity variation of a given load.
    Subtract the lowest velocity from all others in a batch of a given load. Add those differences together and divide by the number of shots.
    Reply With Quote
    Reply

    Bookmarks

    Thread Tools
    Display Modes


    Similar Threads for: how to reduce velocity extreme spread?
    Thread Thread Starter Forum Replies Last Post
    Extreme Velocity Spread Question - I'm perplexed shepardsonp Reloading 29 07-15-2011 09:15 AM
    Extreme Spread Austy Reloading 7 10-25-2010 10:31 PM
    Hodgdon's "Extreme Powder" - reduce velocity variations due to temperature changes Len Backus Rifles, Bullets, Barrels & Ballistics 45 10-14-2010 12:11 AM
    Extreme Spread? Firecat Rifles, Bullets, Barrels & Ballistics 14 09-22-2010 11:53 AM
    Extreme spread Reloading 9 02-07-2005 08:14 AM


    All times are GMT -5. The time now is 12:30 PM.


    Powered by vBulletin ©2000 - 2017, Jelsoft Enterprises Ltd.
    Content Management Powered by vBadvanced CMPS
    All content ©2010-2015 Long Range Hunting, LLC