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It isn't only the bullet "slamming" into the rifliing that is the problem, it is the fact that freebore (or throat erosion, which is about the same thing but less precise) allows the bullet to skew as it comes out of the case. That not only can distort the base of the bullet but also allow it to skid when taking the rifling. Both conditions contribute to inaccuracy, though the former is worse.
Jim
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