Thanks for the replies. The head space was checked by a gunsmith that is well trusted here and he said it is good, in fact beter than most. We used two sets of rcbs dies. I like the idea that the chamber is cut a little to deep, this is probably why when we neck size all is good. Is there a way to measure the chamber depth?
What should he do?
- Thread starter GRiNGo
- Start date
I like the idea of getting the opinion of a different gunsmith. If this is happening with factory ammunition you have headspace (chamber depth) issues. If virgin brass seems to be fine, are you using brass that has been fired in a different chamber, and is the sizing die set correctly?
Like Eagleye said.
The fiull length die could be setting the shoulder back, making the case too short. It would then stretch and separate. Take a factory virgin round and drop it into the chamber. Note the relationship of the case head and the edge of the chamber. probably just the extratction goove stands clear. Now take a full length sized case and drop it in. If it goes in farther, the problem is too much sizing. back the die out a few revs. And scrap that sized case.
If the brass has been fired in that rifle, no need to FL it. To test Eagle's dignosis, take a case fired in another rifle (check to see that it won't chamber) then back the FL die out 3 revs and size. See if it chambers. If not, screw it down a half rev and try again. STOP turning when the sized case will chamber.
Then test that ammo. If it works just fine, you have found the problem to be the sizing die, not the rifle.
I think any FL sizing intended for a rifle at hand should be limited to just enough to allow cases to chamber.
The fiull length die could be setting the shoulder back, making the case too short. It would then stretch and separate. Take a factory virgin round and drop it into the chamber. Note the relationship of the case head and the edge of the chamber. probably just the extratction goove stands clear. Now take a full length sized case and drop it in. If it goes in farther, the problem is too much sizing. back the die out a few revs. And scrap that sized case.
If the brass has been fired in that rifle, no need to FL it. To test Eagle's dignosis, take a case fired in another rifle (check to see that it won't chamber) then back the FL die out 3 revs and size. See if it chambers. If not, screw it down a half rev and try again. STOP turning when the sized case will chamber.
Then test that ammo. If it works just fine, you have found the problem to be the sizing die, not the rifle.
I think any FL sizing intended for a rifle at hand should be limited to just enough to allow cases to chamber.
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