I attempted neck sizing my .308. I used 175 grain Sierra Match King bullets at 100 yards. My results did not come out as expected. Same primer, same powder, same brass prep/deburring, same powder weight and type, same bullet. The only difference is either full length or neck sized. No crimp on either. Maybe I need to try it out at 200 yards to see better results in neck sizing? Maybe some rifles have no sizing preference? Maybe because there are 2 different lot numbers of bullets used (stated in video)? Any helpful information I can try is appreciated.

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