I've handloaded for about 15 years, but only about 100 or so rounds per year, depending on if I have a new rifle or not. I've always full length sized them up to now, and my 270s are on their seventh loading with no signs of weakness yet. (They do neeed trimming each time, though, so the time is coming!)Since I just bought the 243, I thought I'd try the Lee Collet.
The other day I loaded 15 shells from the first box of factory rounds I had fired during the fall, and the rounds chamber nicely. I haven't had a chance to get to the range to fire them yet, though.