Originally Posted by Mikecr
You measure every case after FL sizing everytime?
.17 Remington, .22-Hornet, .223, .22-250, .243, and .30-06.
How much has FL sizing been affecting length on em?
The Wilson trimmer is pretty fast, really precise, and once set doubles as a case length gage.
The .30-06 is the only case that "needs" trimming after every firing. It seems to grow like corn on a hot humid summer night even though the sizing die only bumps the shoulders about .002". The chamber in that rifle is quite rough - the stretch happens just above the base thinning the cases into unusability in 7 firings. I'm going to polish it a bit as one of this winter's many projects. It comes to the to of the list right after I bed two more rifles.
Like most things, this came about because of a learning experience. I had some .223 brass that grew too long - long enough to cause a sticking bolt (but no other pressure signs). In looking for the cause I measured the chamber and the brass and was able to prove the brass had grown too long for the chamber. Nothing bad happened, but I didn't want to have any future issues, so I started checking the brass after sizing by dropping it in the Wilson Trimmer. With all but the .30-06, and to some extent the .17 Remington, it bare touches the case mouth, but it always leaves the case mouths square and I have a clean bevel for seating bullets.
Works for me. YMMV.