Originally Posted by
fredj338
Yes & no. A taper crimp can NOPT possibly hold a bullet in place but a proper roll crimp, into the crimp groove or over the driving band, does indeed help keep a bullet in place.
To the OP, really, working a load up in 2gr increments is crazy, even with BlueDot or other slow powder. Think 0.3gr increments max. Some powders get really weird when you cross the max pressure threshold. You said unsized but what size are they? If less than 0.430", there is little neck tension going on, unless you turn the expander down 0.001"