I started with a cut knob on a 300win and have since removed it to put the MOA scale knob back on. Like others are saying it will get you close to say 500yds but it will vary and it will start to vary lots the further you shoot. You have lots of time before you get your rifle the knob isn't important yet and you don't really need it to get shooting. The advice I'd give is start digging through the site and read all you can on knobs MOA, MILLs, and marked yardage. You can always go old school and put some athletic tape on your turret and mark out your own knob as you prove it. I get why some may give you grief about asking when it's all here somewhere but sometimes a guy just need a push in the right direction. Good luck and happy reading.