Here are possibilities....
1) Threads on barrel not perpendicular to barrel
2) Barrel bent ( seeing this one more and more)
3) Bore is snaking through the barrel blank. Basically, the drill bit wanders as it is creating the bore. If it is pointed slightly off at the crown then that is where the bullets will go. I have an aftermarket barrel with this issue but it is not off enough to cause issues with my adjustment range.
I am sure there could be other reasons but the are the ones I have seen the most over the last 2-3 years.
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