https://bulletin.accurateshooter.com/2009/06/expander-mandrels-not-just-for-neck-turning/ from AccurateShooter.com Fri, 03 Apr 2026 15:50:21 +0000 hourly 1 https://wordpress.org/?v=4.1.26 https://bulletin.accurateshooter.com/2009/06/expander-mandrels-not-just-for-neck-turning/comment-page-1/#comment-2522 Wed, 03 Jun 2009 10:45:41 +0000 http://accurateshooter.wordpress.com/?p=6823#comment-2522 The expander mandrels offered by Sinclair are .001″ and .002″ smaller than the applicable bullet diameter. After springback, even the -.001″ actually leaves you with more than .002″ neck tension and that is just too much for long range shooting. Solution… I had a custom carbide expander mandrel made that is .0002″ larger than the bullet diameter. After spring back, this results in reasonably light neck tension, but enough that you cannot move the bullet with your fingers. Using this expander and a miligram scale has resulted in SDs under 5 fps in my 6×47 lapua (running 6xc brass for large primer, 115s and RL17) – I hope one day expander mandrells are offered by Sinclair in the actual bullet diameter so we can all “really” control our neck tension.

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