Since it sounds like a shoulder issue you're probably going to have to trim either the top of the shell holder or base of the resizing die as suggested above. If you have a belt sander you can use that to take a tiny bit of metal off and load a cartridge and test, then repeat until the rounds chamber and extract correctly.

maybe it would be prudent to cast the chamber,& see if it is cut correctly

I have a Paladin Machine Services bbl. I had him make an ammo chamber check gauge for me when he made the barrel.

My LC brass has been trimmed to 1.355".

I have Redding dies and shell holder.

I have to size fired brass in the Redding FL die, and then run it through an RCBS small base .223 die in order to get perfect fit into the chamber check gauge.

+1

I don't have a barrel from tp555 but I have the same issue with mostly LC brass.

The small base 223 dies fixed the issue.

I also have a chamber guage which has been a lifesaver in this caliber.

When you run the brass into the 223 small base die (I assume it's the sizer die...) how far are you pushing it in?

There is a semi-related thread being discussed right now with problems of ejection. Perhaps you two have the same problem? Same barrel from the same person. As posted, he'll make good on it at no charge to you. He's just waiting on a new reamer.

Kevin

what's the thread title?

Sounds similar, but different results. When mine does chamber and fire, it will eject but won't pick up the next round. Hopefully I can play with the brass tomorrow and verify it isn't user error.

My apologies; I misunderstood you. If your rifle is short-stroking, you need more port pressure. AA1680 will fit the bill nicely in this regard.

Kevin