Redding VLD Bullet Seating Micrometer #09183 (223 Remington, 22-250 Remington, 220 Swift) Bullet Weight_210gr de-primes and expands the neck

de-primes and expands the neck to accept the bullet

243 Bullet Weight 62gr Bullet Style Varmint Grenade Flat Base (VG) Ballistic Coefficient 0

For your convenience the mounting base allows direct  attachment to your reloading bench

Another method is to measure the neck thickness with a ball micrometer

it's the tightest in the industry for a standard measure

Redding VLD Bullet Seating Micrometer #09183 (223 Remington, 22-250 Remington, 220 Swift) Bullet Weight_210gr de-primes and expands the neckRedding Bullet Seating Micrometers are for use with most standard Redding Seating Dies and provide a direct replacement for the original seat plug. They provide a direct replacement for the original seat plugs and can easily be changed from one die to another. Redding Bullet Seating Micrometers for bottleneck cartridges are available for traditional bullet shapes (STD) and for VLD bullet shapes (VLD). They are also available for handgun and straight