You might want to search youtube about seating the bullets. So starting out I set my die to seat the bullet way out (way long) and then start decreasing the length till I get to or close to my book recommended cartridge over all length or COAL I believe is the abbv. Another quick and dirty way is if you have any bought ammo place it in you bullet seater die in the press with the bullet seater screwed almost all the way out...run your bullet up in the ram very easy and then screw down the seater till it touches the bullet....next back it out about 5 full turns...This will put you close to most SAMMI spec COAL length. You will have to use a micrometer to get the preferred length making small adjust downward on the seating die measureing each time seating the bullet a little deeper each time. But then depending on which bullet you are seating say like a VLD style bullet the die or seater stem may push the bullet from the knose and not the ogive so that can make your length change slightly but nothing too drastic. Once you get the right length on the bullet lock down the seater die. Honestly the best way is to find someone close by that can walk you through the process step by step. I which I would of done that because I spent about 6 months flustrated at my reloads and and almost caused me to stop. I know cabelas here in Utah sometime gives a reloading class if you in Utah. Also here is something else to read....
Effects of Cartridge Over All Length (COAL) and Cartridge Base To Ogive (CBTO) – Part 2 | Berger Bullets
One other thing that really messed me up was tring to measure every load on a balance beam. If you have a powder dropper set it up using you balance bean and then charge your loads with it. If you have a electronic scale that works great for measuring your loads. I went to the charge master by RCBS and it works great. Also the hornady Lock N load charge is works great as well.
And one last think I vote for Redding dies as well. The regular FLS 2 die set with bullet seater and the decap/expander die works very well and give you good repeatable bullet tension on the case mouth. I don't really fell the need to go to a bushing die. But if I did it would also be reading as well. I full length size every thing and I consistently get .5moa or less at 100yrds.