You might try te RCBS X-Die for FL resizing. It has a little ledge on the mandrel to prevent the case from stretching during resizing. you trim it once, set the X-Die for that length and then do not have to trim again. A couple of writers have tested these and documented 15-20 reloads without signs of failure.
I just switched this year to the X-die for my AR15 and M1 Garand loads. So far a couple of reloadings worked as advertised (no trimming needed). I had been getting about .005" stretch almost every firing/reload cycle.
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