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For auto loaders the thumb test - measure OAL then stand the finished round on the bullet and press with your thumb on the base od case and apply moderate pressure (10-15 lbs) and measure OAL again - bullet shouldn't move. Another test ( but i would recommend to remove firing pin from your weapon ) would be to lock the slide in back, load the round in mag and release slide. then remove ( slowly) round from the chamber and measure OAL, again, bullet shouldn't move more than 0.001-.002 inch.
For the revolver and semi auto rifle I use lee factory crimp die to crimp into bullet cannelure. For bolt action no crimp needed
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