https://bulletin.accurateshooter.com/2019/07/optimize-your-bullet-rpm-with-berger-twist-rate-calculator/ from AccurateShooter.com Fri, 14 Aug 2026 00:12:43 +0000 hourly 1 https://wordpress.org/?v=4.1.26 https://bulletin.accurateshooter.com/2019/07/optimize-your-bullet-rpm-with-berger-twist-rate-calculator/comment-page-1/#comment-57337 Fri, 05 Jul 2019 15:55:41 +0000 http://bulletin.accurateshooter.com/?p=62881#comment-57337 It’s alright as a start, but it doesn’t calculate flat based bullet stability correctly (see notes on the page), nor does it take into account partially hollow, or plastic tipped projectiles. It’s also only calculating the gyroscopic stability factor (Sg), it does not calculate the dynamic stability factor (Sd). So even if you bullet is gyroscopically stable, within the above caveats, its stability downrange is not assured. If it’s not dynamically stable, yaw (precession and nuation) will not be damped out, but increase, causing not end of problems.

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