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Flattened Primers

 
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  #1  
Old 11-08-2012, 09:51 PM
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Join Date: Nov 2012
Posts: 31
Flattened Primers

I recently bought a new Remington 700 SPS SS in 300 WSM. I'm using Winchester brass and Nosler 150's.

with the following loads i'm getting flattened primers

IMR 4350 63.5gr = flattened primer
RL 17 64gr = flattened primer
IMR 4064 58.5gr = flattened primers

OAL = 2.835 Ogive Length = 2.207
Primers = WRLM

these loads aren't hot by my book. I have checked the head spacing and its good. The brass was all new winchester brass.

any help would be great.

thanks
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  #2  
Old 11-09-2012, 12:06 PM
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Join Date: Jun 2010
Location: greenwood, IN
Posts: 3,546
Re: Flattened Primers

Quote:
Originally Posted by tweek1142 View Post
I recently bought a new Remington 700 SPS SS in 300 WSM. I'm using Winchester brass and Nosler 150's.

with the following loads i'm getting flattened primers

IMR 4350 63.5gr = flattened primer
RL 17 64gr = flattened primer
IMR 4064 58.5gr = flattened primers

OAL = 2.835 Ogive Length = 2.207
Primers = WRLM

these loads aren't hot by my book. I have checked the head spacing and its good. The brass was all new winchester brass.

any help would be great.

thanks
that's a big fat case, and you might want to see if another grain and a half of powder helps (4350) with a mag primer. Sometimes too light of a load will build up excessive pressures. I'd have started with AA 4350 as it's slightly faster than the IMR, but Magpro would have been my starting point.
gary
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  #3  
Old 11-09-2012, 12:11 PM
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Location: Mountians of SW NC, near Asheville
Posts: 1,596
Re: Flattened Primers

"I have checked the head spacing and its good. "

What "head spacing" did you check, pre-fired cases vs. post-fired cases or chamber?
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  #4  
Old 11-09-2012, 04:35 PM
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Join Date: Nov 2012
Posts: 31
Re: Flattened Primers

I took the rifle to Hart's in Nescopeck Pa. They told me that my head spacing was .004 longer and said that it passed the "field Gauge"
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  #5  
Old 11-09-2012, 08:26 PM
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Location: Mountians of SW NC, near Asheville
Posts: 1,596
Re: Flattened Primers

Chamber (real headspace) is pretty much irrelivant to a good hand loader, we make our sized cases fit our chamber.

What you have is excess case headspace for your ammo, meaning you're setting the shoulders back much too far, allowing primers to back way out and then get flattened as the case head flows back to the bolt face. That excessive case stretching will soon cause you a head seperation if you don't correct it.

A turn of a die changes its position right at .072". Back your sizer up maybe a half turn (31 thou) and size a case, then see if it will chamber smoothly; probably won't. Turn the die down about 16th turn (4 1/2 thou) and try again, keep repeating that until you can close the bolt with just a touch of drag on the empty case. Size the rest of your cases and try your loads again, the primers will proably be fine.
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  #6  
Old 11-09-2012, 09:03 PM
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Join Date: Nov 2012
Posts: 31
Re: Flattened Primers

So I'm going to be partial sizing correct? I started to do this and the case that fit the best without doing a full length size had a little bump on the side of the case neck right below the line where the neck was being resized. Is this ok to use? Because the closer I get to where the base of the neck and the shoulder meet the harder it gets to close the bolt so I ended up full length sizing which put me back to square one lol

Thanks for the help in advance
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  #7  
Old 11-09-2012, 09:10 PM
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Join Date: Mar 2012
Location: Wolfesville, MD
Posts: 779
Re: Flattened Primers

all that means is you are not sizing the entire neck, no problem with that, when adjusting your die, remove the firing pin so you can feel the case as you close the bolt just ever so slightly or another words, don't let the bolt fall down on its own
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