Re: New Chronograph
Sounds like you are doing pretty well. It is hard trying to compare two guns to each other as all are different even though they are made by the same manufacturer. You need to worry about your gun. Please list the load you are using. Case, primer, powder, amount of powder and so on. Next, tell us if you started off with each case being measured for length. If so, did you trim each one so that all were the same length? If not, then I advise that you do this. Also, were the brass from the same lot from the same manufacturer? If not, then you are going to get inherent differences between each shot.
The crimp has a lot to do with getting the SD down between shots. In order to do this you need to make sure the case volumes of EACH case are the same. This is why we use the same lot number brass to begin with. The only other way is to measure each case and get the case volume of each one. Without this, you cannot bring down the SD.
Let us know where you want to start.