At this point in my shooting have not killed or practiced past 500 yards, however would like to work towards greater distances. In the leupold 4.5-14 the elevation is 71 minutes of angle vs. 116 in the same scope with a 30mm tube. I shoot a 30-378. At what distance am I maxed with the 25.4 tube vs. a 30mm tube. I understand many variables go into the answer, but a good round about answer will work. My question comes from deciding to purchase the bigger tube or stick with what I am currently working with. Thanks for your responses.