Ok, so I measured the seating depth on my 280AI.
I did this by using a fire formed case and painstakingly adjusting my Redding seating die in tiny increments with a 120 TTSX. I kept adjusting down until I could chamber the cartridge.
I did this twice. With two different bullets. Both measurements were very similar. I took more care the second time and ended up at 2.810. So that's the measurement I'm going with. Unless you guys have better advice.
So here is my question:
I measured the load I have been using with the 120 TTSX bullet using a Hornady bullet comparator. The measurements vary slightly, as do the bullets themselves if you measure them but the load roughly averages 2.668.
I hear all this stuff about seating the bullet "ten thousands from the lands" as a starting point…..I'm 142 thousands from the lands. 14 times that number. The groups are great though. The best was .447 center to center and the worst was .626 center to center. This is in decent wind. The bigger group was shooting off the bipod. The smaller was once I adjusted the scope and was using a Caldwell rest.
I don't even think I would be able to fit the cartridge into the magazine if I was ten thousands off.
Am I doing this right?
I did this by using a fire formed case and painstakingly adjusting my Redding seating die in tiny increments with a 120 TTSX. I kept adjusting down until I could chamber the cartridge.
I did this twice. With two different bullets. Both measurements were very similar. I took more care the second time and ended up at 2.810. So that's the measurement I'm going with. Unless you guys have better advice.
So here is my question:
I measured the load I have been using with the 120 TTSX bullet using a Hornady bullet comparator. The measurements vary slightly, as do the bullets themselves if you measure them but the load roughly averages 2.668.
I hear all this stuff about seating the bullet "ten thousands from the lands" as a starting point…..I'm 142 thousands from the lands. 14 times that number. The groups are great though. The best was .447 center to center and the worst was .626 center to center. This is in decent wind. The bigger group was shooting off the bipod. The smaller was once I adjusted the scope and was using a Caldwell rest.
I don't even think I would be able to fit the cartridge into the magazine if I was ten thousands off.
Am I doing this right?