I was starting a load for a .300 Wby Mag I have in a SS Japanese made Mark V when I noticed two things.
1) When measuring CBTO using 175gr Barnes TTSX bullets, the base of the bullet (which is quite long) has only the boat tail in the neck when the ogive is in touching the lands.
2) I am 0.25" off the lands when I get enough bullet seated in the case. That seems like a lot.
So, just how much freebore is expected in a Mark V?
1) When measuring CBTO using 175gr Barnes TTSX bullets, the base of the bullet (which is quite long) has only the boat tail in the neck when the ogive is in touching the lands.
2) I am 0.25" off the lands when I get enough bullet seated in the case. That seems like a lot.
So, just how much freebore is expected in a Mark V?