Thread: Case trimming tolerances

Greetings,
In the US and using inches the trim length is .010" or 10 thousands of an inch a convenient round number. I have always worked in metric since the mid 1970's so have settled on a tolerance of 0.01mm which is about 0.004" and trim every load. An article in Handloader years ago ran a test on how much difference in trim length made and the answer was not much until the necks became too short. The lengths do have to be the same though. If you only have a couple of calibres then, as Mickey said, the Lee case trimmers will make things simple. If you need to trim much off the cases each time then you are probably sizing the cases too much and case life will be short and you need to go looking for the reason.
As far as advice goes hit and miss approach will usually give hit and miss results. Keep your cases in batches and load, trim, anneal or whatever the whole batch at once so the number of firings is the same for each case. Also keep a permanent record of all your loading additional to marking the boxes the rounds are stored in with the loads contained.
Regards Grandpamac.