Not a Contender but in an Encore I sized brass so that the action would just barely shut, kind of had to snap it. No issues w brass stretching that I could tell.
i mostly neck-size also on the various bottleneck cartridges in my 'tenders. When forming 30herrett, 357herrett, 30reece, 25classic, and the other oddball stuff i shoot i also set dies so as to require a good snap to close the action on a fresh case during
the initial fire-forming.
On some calibers i hunt with a bit (25/35ackley, 6.5x30/30ackley, & 30/30 ackley) a .375win FL sizer die works nicely to size case bodies down as needed without setting back the shoulder.
