Add the shoulder diameter and the neck diameter ,divide by 2 to find the midpoint of the shoulder.
In this case the .375 comparator is closest, that's the size I use.
Hornadys website clearly indicates to use the .375 bushing. https://www.hornady.com/reloading/pr...il-base-kit#!/
Did you even bother to look there ? All I did was google the title of your thread, Hornadys website was the 1st link on the list...
Quote:
LOCK-N-LOAD® HEADSPACE BUSHINGS
C .375"
6mm Remington
257 Roberts
25-06 Remington
270 Winchester
7 X 57mm Mauser
280 Remington
30-30 Winchester
30-06 Springfield
300 H & H Magnum
7.62 X 39 British
6.5 X 55mm Swedish Mauser
7mm Winchester Short Magnum
30-40 Krag
6.5 Creedmoor <------------------------------------ HERE
6.5mm X 47 Lapua