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Problemb with brass?

 
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  #1  
Old 03-02-2010, 11:48 PM
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Problemb with brass?

Hey guys,
Ive got some thing WEIRD going on here. Im loading for a .270WSM, using once fired Federal brass from my rifle. My book (Hornady 7th edition) says case length max is 2.100. Out of 260 cases only 28 of them passed the go-no-go guage set to 2.100. after being thru my F/L sizing-de-capping die (Redding) The rest averaged 2.112-2.119, so I culled them untill I get a case trimmer.
Next using 3 of my 28 good cases I partially set a Hornady SST, 150gr bullet and pushed it up to the lands/rotate and repete 3 times each with same bullets. My c.o.l. was 2.094-2.905!!! So I backed it off .015 and set my seating die to 2.890. all fit in the mag. But the book says 2.785 MAX. Well, I loaded 25 rounds(all of wich fit in the mag) but the bolt closed a bit too hard on about 10 of them, so naturally I backed them all off another .005 now all 25 are set to 2.885. Guess what, still TIGHT. I measured each and every one of them both times and Im not varying by more than .003 ttl. Is this a safety issue? Im heading out to test loads tomorrow so Ill post results and WATCH FOR PRESSURE SIGNS! But Im confused as to why only some are closing tight. Go easy on me, Im still relitavely new to handloading, but I want to know what Im doing wrong here.
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Old 03-02-2010, 11:55 PM
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Re: Problemb with brass?

Im guessing my rifle has a long throat and I know wsm cartriges are a bit overbored, wich could account for the LONG c.o.l. but is what Im doing safe or am I gonna get myself into a world of ..........bad things?
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Old 03-03-2010, 12:26 AM
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Re: Problemb with brass?

Where are they tight at? Are you sure it's not another part of your case that is tight in the chamber?

Winmag, if I were you, I would get a case trimmer and some measuring equipment. I like the LNL Hornady/Stoney Point tools for measuring headspace and OAL. It sounds like you are measuring off of the tip of the bullet and not the ogive. Bullet lengths are going to vary within a lot and using the proper tool will allow you to use a much more accurate reading when going off of the ogive.
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Old 03-03-2010, 01:00 AM
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Re: Problemb with brass?

It almost feels like its pushing hard on the bolt face. Could I have somehow messed up the bottom of the brass while de-capping?
I do plan on getting a measuring tool that measures at the ''O-give'' right after I get a case trimmer. The calipers just dont cut it I guess. Still confused as to why if I backed off from.015 and an extra .005 I still had trouble.You wouldnt think the bullets would have .020 difference even measuring c.o.l. with calipers.
I have 25 rounds loaded in groups of 5 starting at 56.5 grains of IMR-4831. for the first 5. then 57.5 gr on the next 5 and so on in 1 grain incriments on groups of 5 to 60.5gr on my last group.( .4 grains under book max),depending how the lightest 5 bullets shoot(pressure signs not accuracy) it may be a short day. If the bolt closes too hard on any, Ill probably just pass them up for safety reasons.
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Old 03-03-2010, 06:59 AM
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Re: Problemb with brass?

Two guesses

1. You used an RCBS sizing die
2. You did not run the sized brass through the rifle to see if it was properly sized.


A significant number of RCBS sizing dies are just a touch too long and will leave the shoulder to far forward.

Another possibility is:
If the primers are not seated flush then it does the same thing as moving the shoulder forward.
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Old 03-03-2010, 07:59 AM
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Re: Problemb with brass?

As Buffalo Bob said and +1 on that one. Sounds like your die did not bump the shoulder back far enough. Your COL probably was good if it fit in the magazine but your case probably needs the shoulder bumped back a bit.
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  #7  
Old 03-03-2010, 11:10 AM
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Re: Problemb with brass?

Redding dies.
Picked 3random brass and they all chambered with ease. Maybe just happened to grab the right 3.
And Ill check my dies again when I get home. I flat out crushed one brass from having it set too low so in the proscess of adjusting it I heired on the cautious side. Maybe also a mistake.
Thanks for the advise guys. Ill post results later today.
BB good to see your still alive. I wondered if got you froze out. Hows the squirl sniping gion?
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GOD,GUNS,&GUTTS MADE AMERICA, LETS KEEP ALL 3!winmag

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