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Why does my brass look like this?

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Unread 10-28-2011, 05:30 PM
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Re: Why does my brass look like this?

Could well be Paul.

Also it's hard to tell from the angle but it looks to me like your primers are showing some pressure signs. They seem to be almost flat with the base of the shell instead of just recessed a tiny bit. It also appears the firing pin holes are a little exaggerated which would also indicate high chamber pressure.

If your chamber is a little loose that would account for the ring and apparent swelling and that would be exaggerated a bit by excessive pressure.

Might try backing off a half grain or even full grain and use some new brass and see what it looks like.
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Unread 10-28-2011, 06:16 PM
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Join Date: Apr 2010
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Re: Why does my brass look like this?

They look perfectly normal to me. Your chamber is a hair larger than some and the
area below the webbing doesn't expand. Primers look good. I can't see the actual pin hit
well from the angle the photos are taken at though.
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Unread 10-29-2011, 03:50 PM
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Re: Why does my brass look like this?

I agree with what was said about possible flattened primers. They sure look like it.

My question is this. What does FACTORY AMMO look like when fired?? If it has that ringed area around the base then the chamber is screwy. If the casing of a factory round looks A-OK...then there is a screw loose in your reloading procedure.
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Unread 10-29-2011, 09:12 PM
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Re: Why does my brass look like this?

I'll add my two bits worth ok?

  1. Chamber cut with new or incorrect sized reamer. Reamer looks to have been rough. Either that or the chamber was polished with 80 grit. Maybe the chamber suffered an attempt to polish out a defect. For whatever reason the chamber is quite large.
  2. The large chamber, in and of itself, makes little difference to much of anything except that volume is increased after the shot.
  3. If the chamber is out of round, as indicated by the ring you are developing is not uniform then you have problems. I had a Ruger 77 from a friend that shot like yours. The chamber was out of round. I marked each case with a file mark on the head. Loaded each round single shot with the file mark at the top. The next time I met him at the range the rifle shot lights out. He bought it back. Paid a little for the knowledge, though...
  4. If the ring is uniform i.e., the chamber is not out of round, then seeing as you are conservative with your loads only partial resize. By partial resize I mean size only until the die touches the case body. But size the neck at least one caliber down to insure sufficient neck tension to avoid problems.
  5. With the chamber being that rough the chamber is most probably grabbing the case body quite hard. This condition has been reported to be not good.
Just some things to think about.

Hope it helps
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Unread 10-30-2011, 09:42 AM
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Re: Why does my brass look like this?

I think the primers look like they still have rounded edges so the load should be ok. You should get a headspace guage to put on your calipers so you can measure after firing and again after sizing to see how much you push the shoulder back. I don't like to bump more than 2 thous. I would cut a case in half and see if that is where the web ends and to make sure the cases aren't separating. It looks like where the die stops sizing the case. Matt
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Unread 10-30-2011, 10:27 AM
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Location: Texas
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Re: Why does my brass look like this?

Its just like Roy said;
The chamber is large and rough. Typical of the factory chambers.

The only way to realy fix it is to Set the shoulder back at least 1 full thread (Turn) and using a
good reamer re cut the chamber and head space at the same time.

This is normally caused by The reamer and /or the tail stock being misaligned durring chambering
causing the reamer to run/cut on one side and allowing shavings to get under the cutting edge of
the reamer on the opposite side scratching the chamber.

If this is done it should cure most if not all of your problems.

NOTE: Do not polish this chamber because it will only make it worse (Larger)

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Unread 11-02-2011, 01:24 PM
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Join Date: Jun 2011
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Re: Why does my brass look like this?

I'm going to leave the brass thing alone right now as I'm not sure that its a problem. I would like to know the order of your shots in the group. I'm not sure if both groups have a fouling shot or not but I'm going to guess first shot lower left fouler, next shot upper, third shot low and away from foul shot, fourth shot upper touching second shot, fifth shot lower touching third shot??? If this is the case the first thing I would do is try a different scope of any make just to see if the results are different. If the problem is still the same I would look at the barrel to make sure its fully floated and not touching anywhere. I would also check my screws on the stock to the action and make sure everything is ok there. I think this is way more likely your problems for your groups then the brass. Hope this helps.
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