Hi @grandpamac.
Thanks for your input. From all the research I have done( mainly this forum) the cast 151gr projectiles can be quite a loose fit in the neck and prone to moving. The crimp will fix this along with providing more consistent pressure and therefore accuracy.
Below thread along with a few others has plenty of detail.
https://www.nzhuntingandshooting.co....d-308-a-60565/
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