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It may NOT be "bore size" when it enters the bore if the Lee FCD has made it LESS than bore size before it was fired AND the pressure is not enough to "bump-up" the diameter to fill whatever space there is around the bullet.
That can lead to leading and inaccuracy.
That is why the Lee FCD with the carbide ring causes problems for some, while solving problems for others. Id depends on variations in BOTH the die and the gun, and how those match-up (or mis-match) in each situation.
SL1
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