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Can't lower my S.D. HELP!!!

 
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  #8  
Old 01-25-2011, 05:33 PM
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Join Date: Mar 2006
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Re: Can't lower my S.D. HELP!!!

Try Ramshot Magnum powder.
I've had great luck with it in my 300win and 208AMAX

If you want to stick with H1000 you will have to keep trying different powder charges since that is the biggest determining factor for ES and SD.
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  #9  
Old 01-25-2011, 05:45 PM
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Re: Can't lower my S.D. HELP!!!

Quote:
If you want to stick with H1000 you will have to keep trying different powder charges since that is the biggest determining factor for ES and SD.
Do you mean to say that accurately weighed powder to <1/10 of a grain is the biggest determining factor in ES/SD of the MV even after you identify and stay within a decent accuracy node?

I would've thought consistent neck tension would be next, provided you're using good match grade components and stable powders under decent environmental conditions?
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  #10  
Old 01-25-2011, 06:23 PM
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Location: Texas
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Re: Can't lower my S.D. HELP!!!

A couple of thoughts that haven't been mentioned.

(1) Try a couple of benchrest brass prep tricks like deburring your flash holes and uniforming your primer pockets. I found this to make a fairly significant difference in cheap brass.

(2) Instead of (1) buy a box of Lapua brass and try that. It doesn't need any prep.

(3) You may have done this, but if not, set the COL to touch the lands and then vary the powder drop until you get a one hole group.

(4) Make sure you are not oversizing the shoulder. Even though the case headspaces on the belt, you don't want to push the shoulder back more than .001.

(5) Have you checked the runout on your loaded rounds?

(6) What type of barrel and how many rounds?

(7) What's your cleaning regimen?

Hope this helps
Dale
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  #11  
Old 01-25-2011, 06:52 PM
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Re: Can't lower my S.D. HELP!!!

It is important to have consistent charges.
But what you are looking for is a powder charge that gives consistent velocities.

If you are testing at 100yds you may find a load that puts all of your shots in one hole.
But at longer range has a huge vertical due to velocity variance.

I load at the range and work up loads through the chrono looking for good veloctiy spreads.
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  #12  
Old 01-25-2011, 07:03 PM
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Re: Can't lower my S.D. HELP!!!

Thanks RockZ,

Sounds like you're not just looking for a node with a small group. You're also trying to find one that's consistent velocity... I'll buy that.

I tend to fixate on lots of brass prep as TexasHunter described (starting with Lapua or Norma brass) since it's something I can control before I go to the range.
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  #13  
Old 01-25-2011, 08:14 PM
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Location: Searcy, Arkansas
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Re: Can't lower my S.D. HELP!!!

Are you shooting all the rounds at one sitting or comparing results from several times to the range? What is the weather? By weather, I am mainly interested in cloud cover. Any chrono will read differently in the sun than it will with cloud cover. Light, variable cloud cover or periodic clouds, then sun can really mess you up since the light is changing a great deal between shots. This may sound strange, but you might try setting up a large umbrella to shade your chrono to help even out nominal changes in ambient light.
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  #14  
Old 01-25-2011, 09:50 PM
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Re: Can't lower my S.D. HELP!!!

Quote:
Originally Posted by RDM416 View Post
This may sound strange, but you might try setting up a large umbrella to shade your chrono to help even out nominal changes in ambient light.
Now that is a good idea - why didn't I think of that?
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