Size expander plug .002 0ver bullet size. For a .416 dia. bullet use a .418 x .414 expander plug. this will give you .002 clearance to start your bullet and .002 neck tension.
Additional information
Weight
.25 lbs
Dimensions
1 × 1 × 1 in
416 Rifle Expander Sizes
416Cal (R) .418 x .414, 416Cal (R) .419 x .415, 416Cal (R) .420 x .416