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Help, Brass issue with bolt lift.

Possible giant carbon ring just guessing... borescope chamber nk area..new brass without a bullet will just collapse if it hits the carbon ring, also make sure the brass has a good chamfer outside nk could u show a pic of brass, brass with bullet, and die setup..I'm just guessing have no clue
 
Looks like from what I see when I try to resize the brass it bunches up at the shoulder and expands it. Which tells me there was excessive headspace in the last chamber, when I try to push the shoulder back far enough to chamber slightly then it expands every so slightly. But the neck and all the other measurements look good. But so confused on why putting a bullet in it matters. Looks like I should have asked Seekins to buy me some new brass. But I guess I will go ahead and scrap this stuff. I shot a box of factory ammo tonight and even the fired cases chambered without any heavy bolt lift whatsoever.
 
Mushrooming at the shoulder is common on crimp dies set too low. The crimp collar contacts the case mouth and pushes it back into the shoulder. Ive also seen this with poorly designed seating dies that do not allow enough room for neck length variation or diameter.
 
Looks like I should have asked Seekins to buy me some new brass. But I guess I will go ahead and scrap this stuff.
Yes you should have.

Used brass from a previous chamber (or a different gun) and attempting to use it in a new chamber (or a new gun) is bad juju. Unless two chambers are cut with the same reamer by the same guy to very near or the exact same headspace you are asking for issues just like this.
 
Mushrooming at the shoulder is common on crimp dies set too low. The crimp collar contacts the case mouth and pushes it back into the shoulder. Ive also seen this with poorly designed seating dies that do not allow enough room for neck length variation or diameter.
I checked how the dies were set and they are set correct. Even checked Redding instruction manual and it was correct. Just think the brass was too out of whack.
 
I checked how the dies were set and they are set correct. Even checked Redding instruction manual and it was correct. Just think the brass was too out of whack.
Question,
How many pieces of brass are affected here? Is the juice worth the squeeze trying to utilize the brass, or start over with virgin and acquire the correct fire forming. I'm still leading toward a tighter neck as I continue to read here. Start with the reamer print for this chamber, AW2 if I remember? Seat a bullet and compare duameters at the neck. If you intend to recover whatever amount of brass you are trying to save, then you may want to give neck-turning a try to reduce the neck thickness where you need them to be. My guess...you are sizing down the necks with a bushing die, and expander following, for the new spec'ed chamber and the brass chambers. If the necks are too thick, then at the time you seat the bullet, your blowing out the OD of the necks and jamming them in the neck area of the chamber.
This happened upon me when I discovered a long time ago, 5.56 loaded rounds would not chamber in my .223 match chamber. Bullet diameter same, neck thinkness? Well, thats a different aspect.
 
I'm not sold on the idea of an issue at the 200 line. If that were the case, the processed brass would not chamber "well". OP advised, sized brass chambers fine. Issue is at seating projectile.
 
Perhaps I misread? My understanding is, this is a rechambered barrel returned from the maker and the only fired brass the OP has was fired in the old chamber. Reading between the lines, sounds like the old chamber had excessive headspace? Or perhaps the original chamber was a completely different cartridge?
Don't see how that brass would be helpful in the new chamber.
The OP probably should scrap that brass and start over, anyway. Still doesn't explain why resized brass chambers easily, yet that same brass won't once loaded.
Again, unless I misunderstood.
Looks like I missed the part he was trying to use brass from a different chamber.
 

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