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Crushed loads?

 
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  #8  
Old 08-11-2013, 03:00 AM
kc kc is offline
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Re: Crushed loads?

I took out my beams and checked my loads on 4 batches reloaded to book the beams were on the powder just dumped into the loading tray,
Tomorow I will be pulling every .308 I have loaded and changed my powder.
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  #9  
Old 08-11-2013, 05:59 AM
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Re: Crushed loads?

Are you using surplus brass? It can have quite a bit less internal capacity. Just a thought.

Bob
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  #10  
Old 08-11-2013, 06:10 AM
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Re: Crushed loads?

LongrangehunterII put 48 gr fitting the case near the shoulder. If you put the same amount in your case how full does it get?

Not knowing that answer yet but thinking of possibilities:

Are you are using different brand case than the case Lyman used? (Military cases have a smaller internal capacity) Are you using a drop tube? Perhaps your balance beam scale is not correct.

I would use a known weighted object and then set balance beam scale to that value and see if it balances. You must rule out the scale. Then drop the powder through at least a 4"or longer tube into case.

I have encountered some difficulty with powder not fitting a case in the past. I have also compressed my share of powders. As long as the bullet doesn't move after seating you will be fine. Get a precise measurement of a loaded round then measure it again a few days later. I have seen bullets relocate for a longer OAL with heavily compressed loads.

Do some more tests and share your results here. I am interested in all the facts. Lets see if you can solve this issue.
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  #11  
Old 08-11-2013, 09:27 AM
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Re: Crushed loads?

FYI, military brass has a thicker base and web that consumer brass but it's only a grain or two difference in capacity.

It's the powder btw or should I say, shape of extrusion. 'Powder' s a misnomer. All propellants (smokeless) are extruded in sheets and processed into shapes. Burn rates have to do with compounding and extruded shape of the granules.

Thats why some 'powders' meter better than others when you throw a charge. It's the physical shape of the granules that determines how it flows (meters) and how is 'settles' in a case which is why you use a drop tube to 'settle' the powder (extrusion) in cases where the charge takes up all or most all of the internal capacity. The drop tube allows the 'powder' to settle and take up less space in the cartridge body....

Actually, neither here nor there as it's over the top in this case, in the case...lol

It's the wrong powder. Pull it and reload with the correct for the particular caliber/projectile. Don't forget to resize the necks after you pull the bullet.......
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  #12  
Old 08-11-2013, 01:30 PM
kc kc is offline
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Re: Crushed loads?

I always use a droptube when throwing a load.. I should have all the bullets pulled by 3:00
this is Winchester brass never fired I miked all of the cases some were around .003 longer
than posted in my Manuals.
I have some 322 I can change to, its not as accurate but it will get the job done at 300 yards.
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  #13  
Old 08-11-2013, 09:50 PM
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Re: Crushed loads?

Quote:
Originally Posted by kc View Post
I always use a droptube when throwing a load.. I should have all the bullets pulled by 3:00
this is Winchester brass never fired I miked all of the cases some were around .003 longer
than posted in my Manuals.
I have some 322 I can change to, its not as accurate but it will get the job done at 300 yards.
People get overly anal (IMO) about case length. Keep in mind that all bottleneck cases grow a bit each time they are ignited, it's an inherent characteristic of the case and how it indexes in a rifle chamber. The materiaal (brass) 'flows' under ignition of powder pressure and moves toward the bottleneck and case mouth.

I trim to Sammi length +- 0.003 and check after a couple loads and check for cracked case mouths and test springback and anneal at that time if necessary but thats for another thread.... Annealing has been discussed to death on this forum......

When Len posts my review of the Little Crow Brass Trimmer or WFT as it is trademarked, I think you will find it interesting and enlightening.
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  #14  
Old 08-12-2013, 12:18 AM
kc kc is offline
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Re: Crushed loads?

I agree all my knecks are usualy a bit shorter at starting, I always check my brass for cracks
and splits. I have found that after they have been used 3 times they are streched and are weak, so they get crushed and put into a 5 gallon can.
I think the problem is over, I turned the Bullets into .3006s. Its to bad there not SSTs.
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