I am a firearms enthusiast, and I am tinkering with the idea to register for the 2023 Camp Perry competition. I have a question for the members with experience participating at the President's One Hundred competition. How does a competitor zeroes the scope on a service rifle to be used for the competition with two different bullet weight? How do you adjust yours for competition? I plan to use 77Gr SMK for the 200 and 300 yards, and 90Gr SMK for the 600 yards, but I do not know if it makes sense to zero the rifle at 400 yards, since it is a range in between 200 and 600 yards, record the adjustments and go from there. My thoughts are to setup a target at 400 yards at my local range and to make adjustments for both bullets. I reload both bullets using Ramshot TAC fired out of a 1:6.5 twist barrel, and the 90Gr groups very nice at 1/2 MOA at 100 yards. TAC is probably not what most people would use, but most other stuff is not available. The optic will be an Athlon 1-4.5x30 installed on a MI 20 MOA quick detach mount. All recommendations are appreciated, but keep in mind, I do not have the money to entertain a new scope or any other piece of equipment that it is nice to have, but not a must have. I am going to train and compete with what I have now. Any and all input is appreciated.