So I'm going to have my first custom rifle build done and I'm researching to decide what I exactly want. I currently shoot and reload for my tikka t3x tac a1 in 6.5 creedmoor and my savage 110fcp in 338 lapua. I've decided to go with a surgeon built rifle but I'm still up in the air on the caliber. I shoot both rifles regularly at 1000yrd steal target but would like the option to really test and hone my skills out to 1500yrds or even a mile. I've got it narrowed down to 2 calibers, the 260 Remington or 300 win mag. I know there's a big difference between the two but I like the accuracy of the 260 and all the available load data but I'm not sure if its really capable of the limits I'm wanting to push it, and the 300 will reach out there but I'm not sure of the accuracy at those ranges. Any thoughts? On a side note, I don't shoot competition (not yet anyway) and I don't hunt but would like to go on a big game hunt out west some day if I could ever get some time off work