Whoa there. What the heck is up with this?

[pharaoh2]

I spent the afternoon loading some ammo. I just looked at 25 .243 cases I did. I loaded them with a 95 grain Ballistic tip, and saw this:

The case on the left is once fired Winchester brass. The case on the right is brand new Winchester brass. I ran them both through an RCBS neck sizer, no problems. I seated the bullets, and the new brass buckled somewhat, as you can see on the left edge of the shoulder on the right case. What gives? Both cases had the same amount of force applied, and both went through the same process. Can I shoot these? As I said, I ran 25, and measured each charge twice. I'm trying to work up the perfect load, and went through 5 rows going up 1 grain per row. I spent alot of time on these to get them perfect, and I can't belive I missed this earlier. You ever run into this, and are they going to be safe to shoot?

 

[agilent_one]

They'll be fine, as long as the die is on-spec and you've got the die and press set up right. New brass sometimes comes out of my sizer (Redding) like that.

Don't fret.

 

[Lefty Dick]

Excesive seating force caused the case to deform.
Most likely from the fact the case mouth was not trued up and probably not chamfered enough or not at all.
I'd pull the pills personally.

 

[pharaoh2]

Well I feel better, thank you. I admit I'm not the greatest handloader in the world, but I've loaded hundreds of rounds in different cartridges. I've never seen this before. I wonder what causes it to do that?

 

[aftermidnight]

did you measure for length and trim the new brass? i have found new brass to vary from manufacturer.

 

[pharaoh2]

Excesive seating force caused the case to deform.
Most likely from the fact the case mouth was not trued up and probably not chamfered enough or not at all.
I'd pull the pills personally.

I chamfered them all, and as I said, I used the same force. It doesn't matter how many time I do this, the once fired stays true, the new case buckles.

 

[pharaoh2]

did you measure for length and trim the new brass? i have found new brass to vary from manufacturer.

No, I admit I didn't do that. I figured I was good to go with new cases.

 

[Big Guy]

For new brass I FL resize, trim to length, chamfer inside and out! I would pull those and start over.

 

[delta1]

The case on the right does not have an outside chamfer, has the inside been done.

 

[prosper]

back your size die out a bit (the whole die, not just the stem). The brass might be hitting the crimp ring inside the die and buckling. If the brass are slightly different lengths or neck thicknesses different, that might account for it

 

[J Stuart]

Excesive seating force caused the case to deform.
Most likely from the fact the case mouth was not trued up and probably not chamfered enough or not at all.
I'd pull the pills personally.

This would be my answer.

 

[daniellybbert]

prosper has it right
back your die out an 1/8" off of your shell holder
cured quick

 

[pharaoh2]

Well it sounds like the resounding answer is to pull them. That's unfortunate. But in the name of safety, I won't argue. It's strange though, I ran a few more through. Some did it, some didn't and I can't see any difference in them. Oh well, such is life. Thanks all.

 

[agilent_one]

As long as they're within size spec, they'll likely be safe to fire. Frankly, I'd fire those new cases one time before doing any accuracy load development with them.

 

[jimbubba]

They look close enough that they should chamber and fire all right.
I suspect that the deformed cases are longer than the others.

 

[pharaoh2]

They do chamber, but the bullets are just ever so slightly no alingned straight with the case walls. If I roll them, there is just the slightest wobble. I'll more than likley pull them, but I'm wondering if there's any way I can fire form them or resuse them. I'm at a loss here. On one hand I want to play it safe. On the other, it would be a shame to have to toss most of my brand new cases. Suggestions?

 

[agilent_one]

If you want to pull them:

1. Pull bullets
2. Remove powder
3. Decap & size. (Safety glasses)
4. Trim, chamfer.

The cases may look a little malformed, but this will go away after they've been fired.

 

[maynard]

They do chamber, but the bullets are just ever so slightly no alingned straight with the case walls. If I roll them, there is just the slightest wobble. I'll more than likley pull them, but I'm wondering if there's any way I can fire form them or resuse them. I'm at a loss here. On one hand I want to play it safe. On the other, it would be a shame to have to toss most of my brand new cases. Suggestions?

If they chamber, shoot them, that's what fire forming is. Now you have brass formed to your chamber. Just point them down range a pull the trigger, don't worry where they hit on the target. It is only 25 pieces of brass just be glad you didn't find this problem after 200-300.

 

[303carbine]

Be sure the seater die is set up correctly and when you seat the bullets stop half way throught he seating process and give the case a 1/4 turn and seat it the rest of the way down. This step will help keep the bullet straight in the casemouth and inline with the bore.
Chamfer inside and outside the casemouth before reloading. When crushing of the case happens, I suspect that the die is too far down.

 

[ben hunchak]

Depending on the type of resizing die you have......remove decapping stem and resize loaded round, and Bob's you're uncle!