problem with cases

T

terryhawk

Guest
thought i would poll the masses here for thoughts on this problem..
i have been reloading some cases chambered in 7.82 warbird.these cases have a large case head dia. about .580 and are necked down to .308 for some reason after setting the sizing die they seem to randomly push the shoulder back enough to increase the o.d. of the case right where the shoulder meets the case making them difficult to chamber. i checked this by putting indexing ink on the case. not all of the cases do this .do i have a die problem? would annealing help ? the shoulder angle isn't terribly steep seems like this happens maybe 7 out of 20 times. anyone ever have this problem?

m
 
"randomly" scares me.... ??

IMO you have a serious die fit problem and no annealing won't help.

You need a die which closely approximates you chamber dimensions except .0015 smaller diameter at the shoulder, .002-.0025 smaller at the base.

al
 
I had the same problem years ago with a 7 mag. Sent die’s back for checking and was told the die’s was not the problem. Never could figure out the problem. Wish I new about this sight then.
Terry Pohl
 
Sizing die??? Is it FL or neck die? Who made them? Does this problem arise before or after seating a bullet?

Some standard seating dies have a roll crimp feature built in. This feature is activated by screwing the seater die in to contact the shellholder and is dependant on length of brass.
Thats the only known cause for bulgeing shoulders I'm aware of. Its happened to a few reloaders unaware of the situation.

Could it be a shoulder bump neck sizer? Improperly headspaced that could cause a problem. Even a standard neck sizer poorly matched to the chamber might contact the shoulders.
It usually does'nt take to many thousandths to convert a standard neck sizer into a bump die.

As Al said, randoms not good and annealing will not help this situation. Random would lead me to believe its a roll crimp problem. Overall length of brass should be the most "random" number a reloader ever sees.
If its a necksizer screw it out 1/8 to 1/4 turn and see if the problem stops.
If its a FL die its totally mismatched to your chamber.
 
Chamber Clearance Problems ...

Terryhawk .....

I designed the Digital Headspace Gauge to help shooters measure the clearance (at the shoulder) that their handloads have in their particular chamber. It goes beyond the instructions that come with reloading dies, and it takes all of the guesswork out of resizing.

Check it out.

There are other devices that basically do the same thing, but the Digital Headspace Gauge works on ALL different calibers, and it doesn't require special bushings, fittings, or attachments. Its best feature is that it gives very consistent readings.
 
Terry,

The problem definetly is with the die (as long as you are adjusting it correctly). I had this happen with a 25-06 several years ago. What your seeing is a die on the large side and a chamber on the small side of the specs. I actually play this trick on purpose to lengthen cases (with the correct die) to set them up for another chamber that is longer. This way it makes a safe headspace.

When a die is larger in some area than your chamber (base, length, shoulder junction or shoulder angle), the die will push brass into this area during FL sizing. Thus making the cases a little bigger in that area that the chamber. Then Bingo, hard chambering.

In the case of my 25-06, the die was longer in length and a little tighter in diameter so when the die sized it, it pushed the brass forward, thus lengthing the case and making hard to chamber. I do this on purpose sometimes when I have cases that are shorter (by a couple of thousands) than the chamber so to get a nice fireformed feel on closing.

Hovis
 
Accurate Resizing ...

The only problem is that handloads should fit without being able to "feel" them chamber - not even a little bit. Many shooters are finding that when they actually "measure" their chamber clearance (at the shoulder), they're often able to set their die height very accurately. This often reduces case stretching by 80% This makes handloads fit much closer, and they begin chambering like a greased banana.
 
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