Been getting by with the 311299 for years but even though my Krag runs .308×300 I found as many of you have that it doesn't matter as the throats are oversized. The 314299 sized .312 is "IT". Larry Gibson's tried and true starting point: 28gr 4895 and a tuft of dacron runs 1,800 fps and shoots inside 6" at 200 yards in my rifle. Your results may vary. I will experiment with a bit higher charge to satisfy curiosity but am more than happy as is.