I normally start with what the Lyman 49th suggests for bullet length (unless it's a huge distance to the lands with that loading) and work up powder charges. Then I'll tinker with length.
Today I ran low on ammo for my 223, so I set up to load. Checked my data book to confirm the OALon what I had been shooting, which was 2.215. I rechecked the distance to the lands and I could load out as far as 2.28 in this rifle. I had time, powder, and bullets, so I loaded some at the 2.215 and shot a while. Good accuracy, so I'll seat em out a bit further. The closer I got to the lands, the worse the rifle shot. That confirmed the data I had from the last load session.
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