engineermike
Member
Case length has nothing to do with COL unless you over crimp and then it plays hell with accuracy. I however do trim a lot of pistol brass because I crimp everything. But I don't think that 9mm brass is considered straight wall brass either. If you are loading magnum loads in a revolver then case length might be a little more important as you are usually using a roll crimp and that is a whole different animal. Ever since I started using a standard length to my pistol brass I have a lot less fliers on my targets but that's just my results. I have yet to blow a pistol apart by over crimping with a taper crimp but my bullet patterns are a lot better when I don't.