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Loose case knecks...?

 
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  #1  
Old 10-31-2004, 01:25 PM
LDO LDO is offline
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Re: Loose case knecks...?

like u said just go down to the smaller bushing-my-2-dave
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Old 10-31-2004, 02:50 PM
LB LB is offline
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Re: Loose case knecks...?

How is your accuracy, in all of this? Your neck seems a little too sloppy. By the way, it wouldn't hurt to full length resize every so often. In fact, for some cartridge configurations, I prefer to always full length resize.

Good hunting. LB
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Old 11-01-2004, 12:39 AM
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Loose case knecks...?

I am reloading for a 7mm WSM in a Mod 70 Win Coyote, it still has the original chambering and about 1400 rounds through it. I am using a Redding bushing die. Not to long ago I discarded a bunch of brass because the bullets slipped inside the mouth after using the same bushing (.312) as I always used. I concluded that I may have turned the necks to much, since I am new at this.

So I bought 100 more Win cases and started over. No neck turning at all, and using the .312 bushing. I loaded several dummy rounds in the new case and they consistantly measured .313 so I thought I was good to go with the .312.

I fired several sessions with no problem encounterd. My reloads that I used is not really hot, 69.5 H1000 and the 162 AMAX. 3/4 MOA @ 100 most of the time. However, after the third firing and subsequent resizing using the .312 bushing, the same problem came back. The case lengths are in specs. I used a .311 bushing for a few firings and I'm getting loose necks again. Not all the cases are doing this but at least half of them are. Primers are fitting good, case neck and bullet runouts are as consistant as before if I'm reading my RCBS case gauge correctly, as are the neck thickness measurements. But It isn't an accuracy problem.

Should I go down to a .310 bushing? Am I doing something stupid or is.003 under where I need to be? The fired brass measure .320, the loaded is at .313. I've annealed the cases.

Any thoughts on this would be a great help.
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Old 11-02-2004, 03:36 PM
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Re: Loose case knecks...?

In my experience you should start 0.003 - 0.004 under your loaded round measurement of 0.312 with your bushing size or 0.309 Your fired rounds at 0.320 getting swaged down to 0.312 then blownback up to 0.320 is work hardening your brass and its losing tension as well as springback.So what happens when you size it so close to your loaded rounds outside dimension is the loose fit on some brass.Annealing will help unless you've gotten the brass over 700 degrees in which case the brass is dead and needs replacing.Always use Temilac or Tempistic at around 675 degrees for best results.
Lynn
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