If you really want to know what the trim length should be for your chamber you can buy a little top hat shaped plug that would seat in a modified case and give you the base to end of neck dimension for your specific chamber. You simply chamber the modified case with the gage in it and measure the resulting OAL. Sinclair lists them as chamber length gages. I make my own. I've found several of my factory chambers to be longer than expected and have adjusted my trim length to accommodate them.
That's what I do as well, my chamber ended up at 2.042 measured with the modified case and Sinclair. My brass on its 3rd and fourth firing is all at about 2.025 right now. Actually started a hair below minimum from the get-go with reformed 7 SAUM brass.
