.308 range brass

Mr. Guffy has a point I've tried to make over & over again...

*IF* the primer pocket is opening up, where did the brass go?

Everyone looses it over trimming for length, while a bunch of brass gets SHORTER!
Where did the brass go?

People rant & rave about not needing measuring tools or gauges, but without them how do you know where the brass went since it doesn't just vanish...?
 
wow that's a bummer, I have 800-1000 of these FC cases, just a rough guess. How should I measure the primer pocket? what should it measure? I have an old batch of 100 I've loaded 3 times so far primers go in like normal, not too tight, not too loose none have ever backed out. I did however experience some backing out on some 7mm mag range pickups. No gas got out that I could see, but the primer wasn't flush any more after firing a start load of h1000. I diched about 100 of those cases because I wasn't sure.

jeep, Ill bite, where did it go? I have observed the mysterious shrinking cases, 308 trimmed to 2.005 then fired & sized and now are 2.002. where would brass of the case head go. If I had to guess it has to do with the nature of brass flowing in the chamber when fired. But where is it going and why?
 
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With the primers in FC cases, you will notice the looseness while priming: Watch for ANY that: go in too easily, or wont' stay in. Once they start to loosen, toss that lot.
Using tame loads may make them last considerably longer.
 
jeep, Ill bite, where did it go?
Click to expand...

Many years ago I would suggest it could be stretch and or flow and then I would immediately ask the question; or is it stretch and flow? I never got an answer and I never received a question.

Why? I do not believe there was a reloader that understood if the primer pocket expanded the case head increased in diameter, same for case head crush, if the case head shortened from the cup above the web to the case head the case head has no choice but to increase in diameter and when the case body locks onto the chamber the case has no choice but to stretch between the case head and case body.

And then there is the flash hole; I have a flash hole gage, the flash hole gage presents a problem for the reloader; to use it the reloader must measure before and again after. Most of this took place when reloaders were claiming the primer was not a good indicator of high pressure.

F. Guffey
 
I've never measured a primer pocket. The primer seat to easy and it lose. Fire one last time and trash. I have found a tool to tighten up primer pocket's. Only used it one time and it definitely did work but got the pocket's a bit to tight.
 
I have found a tool to tighten up primer pocket's. Only used it one time and it definitely did work but got the pocket's a bit to tight.
Click to expand...

If you have a tool that makes the primer pocket too small the tool is too small. The solution is to purchases tools that are adjustable or in a pack with different diameters.

F. Guffey
 
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