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High extreme spread

 
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  #1  
Old 09-15-2013, 10:32 PM
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Location: Bend Oregon
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High extreme spread

I am reloading for a Savage LRP in 260, I have been shooting Noslers custom comps HPBT in 140 gr, at first I was getting around 20 fps ES, but now after several reloads on the brass it seems my ES is starting to grow, I have changed primers, CCI BR2, federal Gold match, and Winchester large rifle primers, the CCIs are the best,

aside from the differences primers can make, what else in the brass prep dept would influence ES, I am getting over 50 FPS ES now and I am seeing the increased vertical dispersion downrange over 4 inches at 600 yards, I did get some ES down at 6 FPS with hornaday A max , with the same brass prep method

Have been getting groups at 100 yrds in from 1/2 in to 5/8 inch

Usiing Forster comp FL size and seater dies, I FL size each time, with expander ball

Tumble with SS Media for 2 hours or so
using 4831 sc 44.8 gr / nosler 140 CC HPBT

seating depth doesnt seem to effect ES, or accuracy

using a magnetospeed chrony, it does cause POI shift, but would it decrease accuracy ? since its attached to the barrel ?
thanks in advance , any feedback or advice would be appreciated, Scott
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  #2  
Old 09-15-2013, 10:40 PM
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Re: High extreme spread

You need to anneal your brass, the necks are getting hard and brittle, you will start to split them soon if you dont anneal.
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  #3  
Old 09-15-2013, 10:55 PM
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Re: High extreme spread

I have been annealing every 3-4 th firing per the method on accurrateshooter, use the tempil 650 degree paint, spinning in a drill /socket, I have no pressure signs or any split necks some brass 12 x
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  #4  
Old 09-16-2013, 04:44 AM
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Re: High extreme spread

Anything that relates to pressure differences, can explain high ES and/or SD . Neck tension is most important, then OAL. I would throw away the expander ball, get a bushing die, and three bushings to experiment, starting about .003" less than loaded round diameter. Then you also need a bullet comparator. You can find all of these in the Sinclair catalog or web site.

Expander balls pull the neck erratically and are often the sole cause. And your accuracy seems pretty good. Forget about the ES and look at consistent group size.
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  #5  
Old 09-16-2013, 08:11 AM
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Re: High extreme spread

Use Bore Tech Eliminator and see what happens.
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  #6  
Old 09-16-2013, 08:30 AM
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Re: High extreme spread

Quote:
Originally Posted by D Scott View Post
I am reloading for a Savage LRP in 260, I have been shooting Noslers custom comps HPBT in 140 gr, at first I was getting around 20 fps ES, but now after several reloads on the brass it seems my ES is starting to grow, I have changed primers, CCI BR2, federal Gold match, and Winchester large rifle primers, the CCIs are the best,

aside from the differences primers can make, what else in the brass prep dept would influence ES, I am getting over 50 FPS ES now and I am seeing the increased vertical dispersion downrange over 4 inches at 600 yards, I did get some ES down at 6 FPS with hornaday A max , with the same brass prep method

Have been getting groups at 100 yrds in from 1/2 in to 5/8 inch

Usiing Forster comp FL size and seater dies, I FL size each time, with expander ball

Tumble with SS Media for 2 hours or so
using 4831 sc 44.8 gr / nosler 140 CC HPBT

seating depth doesnt seem to effect ES, or accuracy

using a magnetospeed chrony, it does cause POI shift, but would it decrease accuracy ? since its attached to the barrel ?
thanks in advance , any feedback or advice would be appreciated, Scott
I have a question, you mention your group sizes being 1/2-5/8", has the ES change effected your groups?
If it hasn't changed your group size, you haven't said it does or not, then why worry about the change in ES.
I have had an ES of more than 100fps that shot into .3's, I cannot explain how this occurs because it goes against what we all think would be a very inaccurate load, my theory is that for some reason the bullet is being influenced by barrel whip alone and other forces are not influencing the outcome in any large way, obviously the difference in velocity is having very little effect on the bullet, even in regard to POI with no stringing evident. This was from a 10 shot group, shot in 2 5 shot groups, I didn't notice the ES until AFTER I had shot the 2 groups!
Anything attached to a barrel will change POI, ask anyone who shoots with a brake off the bench, and then hunts with it off.

Cheers.
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  #7  
Old 09-16-2013, 09:00 AM
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Re: High extreme spread

Didn't see you mention what kind of brass you are using, I have loaded 400 rounds of 260rem, 200 for 2 different friends, they bought lapua, lapua is good brass but these 400 happen to be the worst lapua brass I have ever loaded, the neck tension and thickness was so uneven I wanted to trash them. When I load them again I will turn a couple thousandths off the necks and use a .292 bushing after annealing. I hope this isn't your case, its a pita! One more side note is that the Nosler custom comp bullets tend to shoot very well out to 600yrds but the meplats are horrible and the bearing surface length can vary almost .040" in 1 100ct box. And as Roy said, take a little copper outta the barrel!
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