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When to throw away brass

 
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  #15  
Old 08-14-2012, 02:20 PM
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Re: When to throw away brass

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Originally Posted by Robinhood493 View Post
On my 300 rum, the only pressure signs I see are very slight ejector marks at 103g of retumbo. I backed it down to 102g and stuck with that. I am getting the best accuracy by far at this load with 3/8"-1/2" MOA @100 yds with 180g Nosler Partitions. The first 3 loadings the primer pockets were normal, but the 4th time they feel very loose. This is all on a factory LSS Remington 700 with a free floated barrel and trigger job. It looks like I need to back down more and try to get the lighter load to group.
With retumbo and 180 hornady bullets in my 30 rum I was getting stiff bolt lift at 100 grains. I switched to rl25 and got the same speed(3300 fps) with a mid-load and less cost to boot(93 gr vs 100 gr). It is also much easier on the rifle, with one finger bolt lift and the ability to load the brass 'till the neck cracks. I'm using a stock lh bdl (6-18x buckmaster on top) with no mods at all(I didn't even bother to float the barrel) and it's a consistant 1/2 moa rifle. I5010 worked very well also with mid charge weights( 5 grains down from top tested) doing 3320 fps with 3/4 moa, but mine went bad and it's rather tough to find good 5010 right now.
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  #16  
Old 08-14-2012, 10:47 PM
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Re: When to throw away brass

I have heard the same sort of rule that if the brass won't make at least three firings without primer pockets getting loose the load is too hot.

I read in an old issue of Precision Shooting an article titled Make Mine a 6mm-284. The author was getting loose primer pockets with just a few firings. His load was not near max but primer pockets didn't last long. His solution was to talk to the maker of his custom reamer and have him reduce the diameter of the case head portion. The brass still was able to extract fine but his primer pockets stayed tight for many more firings.

None of the posters commented on whether their rifles were factory or custom. Might be interesting to see if there is a difference in primer pocket life.
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  #17  
Old 08-15-2012, 05:42 AM
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Re: When to throw away brass

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Originally Posted by AZShooter View Post
His load was not near max but primer pockets didn't last long. His solution was to talk to the maker of his custom reamer and have him reduce the diameter of the case head portion. The brass still was able to extract fine but his primer pockets stayed tight for many more firings.
If it was the diameter of the chamber at the case head, how did he reduce the barrel's diameter at that point?
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  #18  
Old 08-15-2012, 05:52 AM
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Re: When to throw away brass

He used that new reamer with the next barrel.....sorry should have mentioned that. Only alternative would be to cut off old chamber and cut a new one.
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  #19  
Old 08-15-2012, 06:10 AM
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Re: When to throw away brass

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Originally Posted by AZShooter View Post
He used that new reamer with the next barrel.....sorry should have mentioned that. Only alternative would be to cut off old chamber and cut a new one.
All of which means that if the same loads are used in a smaller chamber in a barrel with the exact same bore and groove dimensions, peak pressure's higher than in the previous barrel.

Seems to me the new barrel's chamber would have to be exactly the same diameter as the case (maybe smaller) to prevent primer pockets from enlarging.
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  #20  
Old 08-15-2012, 06:21 AM
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Re: When to throw away brass

I don't have the dimensions but yes there would have to be some clearance. I am only reporting what I read.
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  #21  
Old 09-22-2012, 08:24 PM
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Re: When to throw away brass

4-5 loads when start showing web stress pockets loose.I keep all my brass
that is bad and scrap it,some times I get $1.40 lbs
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