Back to the factory it should go.
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Something is not right there. Even with an off-center throat/leade you should not have a split neck.
What is the history of that brass?
And that barrel/rifle should go back. That will never shoot well, no matter the caliber. Give it up and find a new supplier. The one you've been dealing with is selling 'culls'.
Cheap new Wolf steel case ammo. Could be a fluke unrelated to off-center throat. But it's what caused me to look at the chamber.
All three are different manufacturers and came from different suppliers. This last one is a Howa rifle and not a barrel for an AR. I've contacted Howa about replacing the barrel/rifle.
Ok then. I thought I was the only poor son-of-a-gun who gravitated to the worst barrel in the doggone store.
I know how it feels. You find a good factory barrel somewhere, then you go buy yourself a 'powerball' ticket.
Me? I've given up.
It seems the ways a factory barrel can be jacked-up is as limitless as the number of stars in the heavens.
YMMV.
A while back I did some work on a couple of military Ross rifles....the bores,chambers and barrel ODs were concentric within .0001 "...the chamber reinforce was concentric with the bore to the extent that I was able to skim the external surface so closely that the raised stamping of the proof marks was removed ,while the blue was just burnished.....made in 1916..
Nice. Wish I could find a barrel like that.
My Howa went to the repair facility. It's been there a week. Estimated repair time is 4-6 weeks.
BP | Bronze Point | IMR | Improved Military Rifle | PTD | Pointed |
BR | Bench Rest | M | Magnum | RN | Round Nose |
BT | Boat Tail | PL | Power-Lokt | SP | Soft Point |
C | Compressed Charge | PR | Primer | SPCL | Soft Point "Core-Lokt" |
HP | Hollow Point | PSPCL | Pointed Soft Point "Core Lokt" | C.O.L. | Cartridge Overall Length |
PSP | Pointed Soft Point | Spz | Spitzer Point | SBT | Spitzer Boat Tail |
LRN | Lead Round Nose | LWC | Lead Wad Cutter | LSWC | Lead Semi Wad Cutter |
GC | Gas Check |