I have 100 pieces of new norma brass and would like to trim them all uniform after fireforming, however by shooting these fire forming loads untrimmed the accuracy is not going to be there like if they were all trimmed to the same length. I would prefer to have accurate loads I can use while fireforming but would also like to do my trimming after the first firing. Does anyone trim before and after the first firing? Please explain what your process is for this. Thanks.