I have a question. I am loading for the 375 Ruger, and I am getting excellent accuracy with the Hornady 300gr RN bullets. However, I have found that my velocities aren't what I was expecting. Being between chronos, I am using a ballistics calculator to figure out my velocity. I am using a load shot in the same barrel length and action, but instead of the 2600FPS published in Handloader, my ballistics calculator shows the velocity to be closer to 2300FPS. I shot a group at 100 yards, and then I shot a group at 200 yards, I took the measurement between the groups and started playing with the input velocity until the calculated 100 and 200 yard measurements matched. I am not using the exact components, they used CCI primers, I am using Federal, I also am not seating the bullets as deep. Would this be enough to cost me 250+ FPS? I am planing o using this rifle on an upcoming cow elk hunt, and I am not likely to change the load between now and then, but until I get another chrony, are the ballistic calculator's numbers to be trusted?