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Question about shooting groups

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Unread 04-14-2010, 01:58 PM
Bronze Member
Join Date: Dec 2009
Location: Arkansas
Posts: 51
Question about shooting groups

When testing loads, do you let the barrel cool down between each shot or shoot one right after another? I am trying to get my 300 RUM dialed in as good as I can. (I have the sporter barrel) My groups (3 shots) are almost always around 3/4 to 1 1/8 inches no matter what load I shoot. I get the occasional 3 shot 1/2 inch group, but 30 minutes later the group may be 1 1/4. I have not been letting the barrel cool between shots. I was just wondering what the "pros" do. Thanks for your help. I have made a lot of progress in the last 3 months (and spent a trainload of $$$$$)!
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    Unread 04-14-2010, 03:33 PM
    Platinum Member
    Join Date: Oct 2007
    Posts: 1,213
    Re: Question about shooting groups

    Are you doing load development, or sighting in?

    If I am doing my final sight in, I start with a fowled bore and shoot a 5 shot group, but I let the gun get COLD between shots......I want to know my cold bore zero (I always do this when the temps are as close as possible to the ones you will hunt in). Mostly for the ammo's sake...your cartridge warms up in a hell of a hurry when sitting in a warm/hot chamber and velocitys can clime with the temps). I do not worry about stress-induced shifting of groups....a bbl that has not been properly stress-relieved may start to walk shots when it warms up, and I should already know about it (see below).

    Now, knowing the above, I always shoot a couple of long strings with every new tube. Heat it up pretty good. Start with a cold/fowled bore and just start shooting a big group( # of shots, not group size ) . If there is stress, it will show up. You only need to do this once per bbl (I feel). Also, it is almost a moot point with a custom bbl. BUT.....factory bbls may walk shots.

    When doing load development, I usualy shoot 3 shot groups (hunting guns). I do wait for the gun to cool some between groups, but , unless it is very hot out, or you are shooting a whole bunch of groups, I don't wait to long. I never wait for a COLD gun....that takes all day!!!

    Last edited by 4xforfun; 04-14-2010 at 11:32 PM.
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    Unread 04-14-2010, 06:40 PM
    Gold Member
    Join Date: Feb 2008
    Location: Goshen, IN
    Posts: 844
    Re: Question about shooting groups

    For hunting I shoot my 3 shot group as fast as I acuratly can. I let barrel cool down between groups not cold but for 10 min depending on temps. This will show u if bullets will react diffrent in a warm barrel.
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    Unread 04-14-2010, 06:53 PM
    Platinum Member
    Join Date: Feb 2009
    Posts: 3,546
    Re: Question about shooting groups

    Depending on temps, no less than 3 and no more than 5. Waiting can sometimes be a PIA but, sometimes I'll take 2 guns and alternate shooting them. Some will also do some reloading while they wait.
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    Unread 04-16-2010, 10:36 AM
    Bronze Member
    Join Date: Jan 2010
    Posts: 65
    Re: Question about shooting groups

    what is your cleaning process?
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