I can't speak about barrels, but I experienced a significant increase in accuracy with my Shield 9 1.0 (5,000 total rounds) when I started using Winchester NATO rounds. I keep detailed accuracy records of all my range sessions, and my accuracy with the NATO ammo was about 30% greater than it was with "ordinary" ammo. As a bonus, Win NATO costs the same as the ordinary stuff. Win NATO is loaded to +P standards, but is not labelled as such. I think the increased velocity contributes to improved accuracy. So try Win NATO and see how it goes. You might save yourself the cost of a new barrel.
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