As we know, the bottleneck rifle cartridge lee fcd uses a collet and fingers to give a 'press in' crimp around the neck to the projectile, vs taper, or roll. ( pistol lee fcd seem to default to crimp type as per cartridge, taper or roll )
Was looking at some hydrashok ammo in .380, and noticed a row of marks circling the case, near the lower edge of the projectile, but not below it, you can see the ghost line where the projectile base is, and this row of marks is above that slightly. Very very fine vertical impressions, evenly spaced, and as thin as a hair, making a row all the way around.
Seems to me this is a factory compression crimp. I havnt seen this on straight wall autoloader cartridges before. ( On occasion I see revolver cartridges with a ring in them at/just under the base of the projectile. )
Was looking at some hydrashok ammo in .380, and noticed a row of marks circling the case, near the lower edge of the projectile, but not below it, you can see the ghost line where the projectile base is, and this row of marks is above that slightly. Very very fine vertical impressions, evenly spaced, and as thin as a hair, making a row all the way around.
Seems to me this is a factory compression crimp. I havnt seen this on straight wall autoloader cartridges before. ( On occasion I see revolver cartridges with a ring in them at/just under the base of the projectile. )