I have only had to trim a few after four firings I have a few that won't hold a bullet tho seems odd so I full length sized them after sizing there the same 224 bullet slides in and out no tension it hornady brass neck thickness measures the same with a mic to my skills anyway I'm not really experienced with reloading but I have loaded my share and built my share of motors so I know how to use the tools And am good with my hands I check the lengths with my Lee trim gage after every firing so I know bout the trimming I tryed full length sizing this time case I have neck sized all in the past like I said before I tryed 10 different factory loads before hand loading none of witch shot well ether my 223 Remington was similar but not as bad of groups now I have handloaded to a quarter size groups with CFE 223 and 40 grain v maxs
