I'm preparing to reload for 308 Winchester in my AR 10. I wanted to compare the bullet drop of various bullets and powder charges using Varget, thinking the flattest trajectory would result in the most reliable overall round.
I went onto my Hornady manual for 308 Winchester, found the start and never exceed powder weights and noted the corresponding muzzle velocities. I then plugged that, along with the BC in the Hornady manual, and set the sight in distance to 100 yards. Then I ran the calculator, and viewed the cheat sheet, making note of the mil dot drop at 200 yards. Here is the result
149 GR BC .415 2300fps 0.9 2700 fps 2.0
169 GR BC .450 2100fps 1.1 2600 fps 2.2
175 GR BC .530 2000fps 1.2 2500 fps 0.7
I understand that in general a heavier bullet is going to drop faster, and that a bullet with a better BC will drop slower. However, I don't understand why for the 149 GR and 175 gr bullet the higher muzzle velocity dropped more.
I went onto my Hornady manual for 308 Winchester, found the start and never exceed powder weights and noted the corresponding muzzle velocities. I then plugged that, along with the BC in the Hornady manual, and set the sight in distance to 100 yards. Then I ran the calculator, and viewed the cheat sheet, making note of the mil dot drop at 200 yards. Here is the result
149 GR BC .415 2300fps 0.9 2700 fps 2.0
169 GR BC .450 2100fps 1.1 2600 fps 2.2
175 GR BC .530 2000fps 1.2 2500 fps 0.7
I understand that in general a heavier bullet is going to drop faster, and that a bullet with a better BC will drop slower. However, I don't understand why for the 149 GR and 175 gr bullet the higher muzzle velocity dropped more.
