have been shooting a 22-243 mdlstd 1-9 twist 27" load 42gr.h414 210fed 52gr. horn.match velo.3870 -group at 100yds. .349 5 shots. useing w-w cases,had dave kiff at pacific make my reamer W/258 neck instead of a 254/256 so as not to neck turn or ream. now after 5/6 reloads necks have small cracks.any input?? thanks for the opportunity to speak with more savy shooters.location Bend Or.