Your rifle already knows what it likes.

Most people never write it down.So they pay for the same lesson twice.

Zeryn Precision

Get the appWatch Proof House

Available now

Free. On your phone now.

Load development, not just trajectory. Reloading, COAL and CBTO, factory ammo testing, custom projectiles. Type in your chrono numbers and they go straight into the load they belong to.

Get it on the App StoreDownload for Android
A load development ladder in the Zeryn Precision app, showing velocity by powder charge.
Load workupLadder tests charge by charge, so you stop guessing where the node is.
A DOPE table in the Zeryn Precision app listing drop and drift by distance.
DOPEEvery load, every distance, in one table you can actually read at the bench.
A factory ammunition comparison in the Zeryn Precision app with a winning load highlighted.
Ammo testShoot the boxes against each other and find out which one your rifle likes.
A group size history chart in the Zeryn Precision app trending over several sessions.
GroupsGroup history over time, so you can see whether you are actually improving.

Coming to Google Play. We've submitted the app and we're still waiting to hear back from Google. Until then, download it straight from this site. Updates are free.

Proof House
The Proof House channel banner: an investigator's desk with patent drawings, photographs and a typewriter.

The channel

Firearms history, told properly.

Proof House is the documentary channel made by Zeryn Precision.

Watch on YouTubeProof House merch

In the workshop

Gear is coming.

Cleaning and bench gear, chosen and checked before it carries our name. It isn't ready yet, and we won't sell it until it is. Join the list below to hear first.

Straight answers

Questions we actually get.

Is the Android app on Google Play?

Not yet. We've submitted it to Google Play and we're still waiting to hear back from them. Until then you can download the app straight from this site and install it yourself, and updates are free.

Is the app free?

It is free today, and everything in it now stays free. Some things we want to add cost money to run, and if that day comes we will say so plainly and charge for those parts only. No surprises, no locked doors on what you already have.

Who is behind this?

Zeryn Precision. Everything we put our name on, we use ourselves first.

What is coming next?

Cleaning gear first, because it is the stuff you use every time you shoot. Join the list and you will hear about each one as it lands, not a month later.