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Lowering Extreme Spread

 
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  #1  
Old 09-08-2011, 09:49 PM
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Lowering Extreme Spread

I have read some post here in the past where some of you have achieved incredible ES numbers from your reloads. Some even in the lower single digits. How did you go about lowering your ES until it was even in the high single digits to low double digits? I have a tight group load for my 7mm that has an ES of 26 Fps. I know that at longer ranges it will begin to open up my group. Whereas if I could get that ES lower it would be more consistent at longer ranges.
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Old 09-08-2011, 09:52 PM
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Re: Lowering Extreme Spread

One thing I learned long ago is to move the chronograph at least 18 feet out when testing. This lowered my ES by at least 20 to 30 fps. Seems the muzzle blast will really rattle the screens.

Jeff
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Old 09-08-2011, 10:23 PM
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Re: Lowering Extreme Spread

Quote:
Originally Posted by Firecat View Post
I have read some post here in the past where some of you have achieved incredible ES numbers from your reloads. Some even in the lower single digits. How did you go about lowering your ES until it was even in the high single digits to low double digits? I have a tight group load for my 7mm that has an ES of 26 Fps. I know that at longer ranges it will begin to open up my group. Whereas if I could get that ES lower it would be more consistent at longer ranges.
I work on SDs first and groups later because the SDs are related to powder,primer,case
size and uniformity,bullet weight.

If you get good SDs with this combination then try other type bullets of the same weight
to find out what bullet your barrel likes, and for better groups. then play with bullet seating
depths for the final accuracy potential.

Only change one component at a time or you may miss a great load.

I am allways happy if I get the SDs below 15 on lighter calibers (17 to 6mm)

With the 7mms through the 338s I look for 10 or lower.

Oddly enough the big bores are notorious for SDs below 5 (Because the bullet weight
is normally 350 + grains they are not effected as much by slight differences in combustion
pressures as are the lighter bullets.

In general the lighter the bullet the higher the SDs (Of course there are exceptions in some).


J E CUSTOM
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Old 09-09-2011, 11:16 AM
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Re: Lowering Extreme Spread

+1 change one component at a time.

I have been sucessful at reducing my ES and SD by beam-scale weighing every load, playing with primers, and making sure my seating depth is a uniform as possbile.

I also found that my number became more consistent by annealing my brass, and on some that was uneven in neck thickness, cleaning the necks (meaning turning it to get a uniform thickness). some is very uniform to begin with; some is not, it just depends on the lot. My 7WSM Winchester brass was incredibly uniform over the 25 pieces that I checked with a tube micrometer (in at leasst 4 or 5 spots around the neck) at random from several bags.

Jeffvn
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Old 09-09-2011, 09:05 PM
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Re: Lowering Extreme Spread

I am interested in some of the responses to this question as well. I usually put my chrono from 10-15 feet from the muzzle. I can't seem to get my ES down no matter what I am trying. Maybe I need to back my chrono up even more with my 7mm.
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Old 09-09-2011, 10:41 PM
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Location: So. Utah
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Re: Lowering Extreme Spread

I usually try to place my Chrono 6 solid paces away from the end of my muzzle. I know that it has to be between 18 and 20 feet.
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Old 09-09-2011, 10:59 PM
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Join Date: Aug 2011
Location: Sioux Lookout, Ontario
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Re: Lowering Extreme Spread

I'm shooting .338 LM. I have my chrono about 10ft from the muzzle. Just to give you an idea, my ES on the Barnes 265LRX's over 5 groups were 36, 66, 71, 127, 173. On the 300gn SMK's it was 11, 17, 18 and 27 over 4 groups. You can see the difference. Also, the 300gn SMK's shoot very well versus the 265LRX's.
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