If you still have a clean bore flyer after your accurizing, which I suspect you will. You could try coating your projectiles. Some say leaving a film of oil in the barrel will also help, but how much and who wants to try and follow up a shot thru smoke if needed. Projectile coating is easier to get consistent. I still loose a bit of velocity on a cold clean barrel but my POI is always where I want it. It is less of a variable and predictable.
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