I have a lyman manual case trimmer now and it works good for all my needs till now. It doesnt seem to lock in my 338 lapua case well and is hard to center it with base to mouth. Im not getting square cuts either witch to me is a very bad thing when looking for accuracy. I think that it is just not big enough for the 338 lapua case, at least the locking end for the base of case. Does anyone have good recomendation for a good case trimmer that will hold bigger cases well and cut true, square case mouths?