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<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: pepperbelly</div><div class="ubbcode-body"> I think I know this but want to check and be sure. I do NOT need to crimp .308 when used in a bolt rifle- correct?
Jim </div></div>
and a hush falls amongst the the audience........YOU ARE CORRECT SIR!
when you size the case the neck gets squeezed down to a certain diameter...
measure that....
when you seat teh bullet that diameter will change...
measure it...
the difference will tell you your neck tension..
example:
you resize & your neck mics at .333 seat a bullet & it reads .335
that give you a .002 neck tension (what most use)
that is sufficient to keep the bullet from moving around... no crimp necessary...
however some autoloaders (ar10) like a light crimp to ensure teh bullet doesn't slip under recoil in the mag... causing the bullet to push back in teh case & creating a dangerous pressure spike...