Comments on: What Happens When You Fire the Wrong-Sized Ammo https://bulletin.accurateshooter.com/2014/12/what-happens-when-you-fire-the-wrong-sized-ammo/ from AccurateShooter.com Wed, 15 Apr 2026 14:06:46 +0000 hourly 1 https://wordpress.org/?v=4.1.26 By: Patrick https://bulletin.accurateshooter.com/2014/12/what-happens-when-you-fire-the-wrong-sized-ammo/comment-page-1/#comment-46078 Tue, 02 Dec 2014 03:40:24 +0000 http://accurateshooter.wordpress.com/?p=2997#comment-46078 I guess those little vent holes in actions are there for a reason!

]]> By: jthyttin https://bulletin.accurateshooter.com/2014/12/what-happens-when-you-fire-the-wrong-sized-ammo/comment-page-1/#comment-1739 Tue, 21 Oct 2008 20:55:00 +0000 http://accurateshooter.wordpress.com/?p=2997#comment-1739 Pistol Example:
My experiences are from IPSC (practical shooting):

As editor noted, shooting 9mm in 40SW is quite common. I run into it maybe once a year. It’s not that shooter doesn’t know the caliber, but a single 9mm round is mixed with reloaded 40SW by accident.

9mm leaves the 40SW muzzle at maybe 100m/s (350fps) and at close range it even hits the target. Usually the gun won’t cycle, so shooter needs to “rack” the gun.

Most of the time Range Officer stops shooting ASAP, since strange muzzle blast hints that something is wrong. If it’s e.g. a squib load (cartridge without powder), clearing the malfunction and firing again could blow the gun…

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