I'm reloading for a 7mm WSM
using a Redding bushing die. I've noticed on other dies as well as Redding, the inside neck dimension is .280, when using a button. My loaded shells are at.313 so I used a .312 bushing. When measuring the inside neck it comes out to .281, and when using a .313 it comes out to .282. \
Is it better to use an inside diameter that is bigger? Or how much tension in thousandts shoud you have?