It was keyholing about 3 rounds from every mag. Started at about 450 rounds...
Local to where?
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Mine has the rings as well although it might be worse overall than your original. I don't know what they are doing to get the rings machined in. Can't say I've ever seen that in another barrel although My Ruger MKIV has 3 rings in it that don't seem to catch lead. It's very accurate.
I'll attempt to get a replacement barrel and then see if I can find ammo that doesn't lead it up.
What ammo did you use in the new barrel? Did you have to return the original barrel to Taurus?
I received the replacement TX22 barrel today. Seems slightly better than the original except for a 1/4" section in the middle.
I simply don't understand why Taurus doesn't improve the machining of the rifling. It couldn't cost much per barrel and I can't see it effecting sales if a couple of dollars were added to the price. It would certainly improve word of mouth advertising.