Snap Caps & Dummy Rounds for Dry Fire & Malfunction Practice

Modern firearms are “dry fire safe” in that they don’t need a round or snap cap in the chamber to safely work the trigger mechanism through the full range of operation. However, snap caps are a useful tool for deliberately inducing a “failure to fire” event during live training to help perfect the “clear a malfunction” sequence into muscle memory. 

Snap caps are commercially available from a number of manufacturers, often in sets of five for handguns and sets of two for rifles and shotguns. However, it’s often cheaper to make your own dummy rounds using commercial ammunition components.

https://amzn.to/40f7fth

In my military service, a dummy round was an inert training aid that can be easily distinguished from live ammunition by having indentations on the sides of the brass, being a different color entirely, or a combination of both feel and appearance. These dummy rounds were used in training personnel to use weapons in a safe manner, often in classroom locations. Lessons on how to load, arm, and troubleshoot a failure to fire could all be done as slowly as needed before going to a range and doing it live. If you’re helping to introduce new people to the shooting sports, then dummy rounds are a great tool for teaching basic firearm manipulation, how to load, unload, and so forth.

Making Your Own

I like to make my dummy rounds with a drill press by drilling holes through the sides of the cartridge case for an easy visual indicator that they aren’t live ammunition. Since I’m a handloader, I can omit the steps of priming and charging a round before crimping in the bullet. This leaves me with a dummy round that has holes in the side for visual identification, but weighs very close to what a live round would weigh. I find this to be useful for properly weighting a handgun magazine, as 15 rounds of 115gr 9mm ammunition is about 3.5 ounces of additional mass if you’re practicing “draw from concealment” drills at home.

The author's handmade dummy rounds

Some of you may be wondering “Why not just take a live round and drill through it?” I’ve done this when no other option was available to me, and it works because brass doesn’t spark. I don’t recommend it, though, because there’s still a lot of steel-cased ammunition on the market and I don’t think the risk justifies the potential reward. 

Additionally, if you drill a live round and then pour the powder out the holes, you still have to deal with the primer. You can’t use your firearm to do that, either, because the chamber would be directly exposed to the hot primer gas and you might dislodge the bullet into the barrel.

For dummy shotgun rounds:

1. Take a spent hull and fill it with BBs and epoxy just below the crimp line. Because the vast amount of mass in a shotgun shell is in the lead shot, you really have to add a filler material back in to get the right weight/feel.
   
   
   
   
   
2. Wait for the epoxy to harden, then cut the crimp away at the crimp line.
   
   
   
   
   
3. Drill the visual indicators in the metal part of the hull and drill out the spent primer. 
   
   
   
   
   

This is a tad more expensive than pistol or rifle dummies, but still quite a bit cheaper than commercial snap caps or dummy rounds. 

Concerns

“Is there a risk of having a bullet from a homemade dummy round come loose into your firearm?” Yes, but I've not yet encountered that in reality. I’ve experienced an AK-style rifle (Saiga .308) slam uncrimped match ammo so hard into the chamber that it unseated the bullet spilling powder everywhere, so it’s entirely possible that this “inertial bullet puller effect” could happen with a dummy round. If you’re worried about that, then don’t use homemade dummy rounds mixed with live ammo for live training.  However, I haven’t experienced this with dummy pistol ammo, and the dummy shotgun ammo is epoxied in place.

Conclusion

Dummy rounds are useful for teaching new shooters the manual of arms with a firearm and for working misfire drills and dryfire practice for more skilled shooters. I cannot recommend strongly enough that every prepper incorporate dummy round-enhanced training drills at home, as they are incredibly valuable to skill building and skill retention and don't require range fees or expending live ammunition.

Dummy rounds are also cheap to purchase and easy to make if you have reloading tools, and I encourage you to buy or make them at your next opportunity. You don't need a whole lot of them, but you should have a few on hand for practice and education.