Suppressed ammo guides · editorial reference

FN 502 Tactical Ammo Pairing: Which .22 LR Loads to Try Suppressed

The host post covered the gun. This one covers what goes through it, and why a three-box experiment beats a case of guesses.

Short answer

Treat ammunition for a suppressed FN 502 Tactical as a testing exercise: buy small amounts of subsonic, standard-velocity and lead-free loads, note which ones cycle cleanly, and only then scale up. Published specs and the can maker's guidance beat forum folklore.

Why ammo is the real variable

The FN 502 Tactical is a .22 LR pistol with a 15+1 capacity, and the listing we link describes a flat dark earth model with a threaded barrel of about 4.6 inches. Our FN 502 Tactical host guide covers the pistol itself. This page picks up where that one stops: the stuff you actually feed it.

Rimfire pistols are the pickiest eaters in the suppressor world. The cartridge is a thin rimmed case with a priming compound in the rim, and the pistol's action is driven by the small amount of energy the cartridge provides. Change the bullet weight, the powder or the velocity and the action can behave differently. Add a suppressor and you have changed the back pressure as well. The pistol and can combination is the system you are testing, not either piece alone.

The five kinds of .22 LR you will run into

Load type	What to expect	Watch out for
Subsonic	Intended to keep the bullet below the speed of sound so there is no crack	Less energy to cycle the action; some pistols short-cycle
Standard velocity	A common target-shooting category that often sits near the transition	Check the box; it may or may not be subsonic in your setup
High velocity	Hotter loads that are typically supersonic	The bullet crack returns; check the suppressor maker's guidance
Lead-free copper	A different bullet material designed to avoid lead	Light bullets are fast; velocity may be supersonic
Very low-power short-case loads	Designed for quiet, low-energy work	Many semi-autos will not cycle them reliably

The categories are generic, not rankings of specific products, and velocity depends on barrel length and temperature, so check manufacturer data for the load you buy. For a deeper comparison of named subsonic products, see RimfireAmmo's subsonic .22 LR loads compared.

Where the lead-free option fits

The CCI Copper-22 Lead-Free 21-grain hollow point is the lead-free entry on this page. It uses a copper-based bullet rather than lead. Two practical points:

It is a light, fast bullet. Do not assume it is subsonic. Look at the maker's published velocity before you treat it as a quiet load.
Lead-free is about the bullet. Residue inside a rimfire suppressor comes from several things, including the bullet, primer and powder. Reading the maker's full description tells you more than the headline claim.

RimfireAmmo covers this load's strengths and limits in its CCI Copper-22 guide, which is worth reading before you commit to a large quantity.

A small-batch testing routine

This routine is how we would approach any new rimfire load in a suppressed pistol. It is a plan, not something we ran on this particular pistol.

Start with the owner's manual for both the pistol and the suppressor. Confirm the rated cartridge and any ammunition notes before you begin.
Buy a few small boxes across two or three load types. Do not buy a case of anything yet.
Clean the pistol first so you begin from a known state. Dirt is the usual reason a marginal load stops cycling.
Fire each load in a short session and write down what you see: does the slide lock back on empty, do rounds feed and eject cleanly, do you see any light strikes?
Repeat with the suppressor off, if practical, so you can tell whether a problem is the ammunition, the pistol or the can.
Note the conditions. Temperature changes how the same load behaves.
Only then consider buying more of whichever load did best.

Cleaning and expectations

A rimfire pistol with a can on it gets dirty quickly. That is true for every host we cover, and the FN 502 is no exception. Lead, carbon and powder residue build up in both the pistol and the suppressor, and a dirty system is the likeliest reason for a load that ran fine yesterday to jam today. Read the can maker's cleaning guidance, and see our suppressor cleaning guide for the general picture. Wash your hands after handling anything dirty, because rimfire residue includes lead.

Quick picks by goal

If you want the quietest sound and don't mind pickiness, put subsonic loads at the front of your testing list.
If you value reliable cycling over the last bit of quiet, include a standard-velocity load and see how the pistol behaves.
If you want to reduce lead around the shooting bench, include a lead-free load, with the speed caveat above.
If you want maximum simplicity, pick the load that cycled best in testing and buy more of the same lot.

A sibling host is the Kel-Tec P17, which has the same ammunition questions in a lighter gun. If you want to see how .22 compares with subsonic centerfire for quiet shooting, RimfireAmmo has a piece on suppressed .22 versus subsonic centerfire.

Legal note

All of this assumes a lawful suppressor in a state that allows them. Federal rules changed in 2026 and state law varies, so start with our buying walkthrough and check your state.

Bottom line

Do not pick .22 LR ammunition for a suppressed FN 502 Tactical by reputation. Test a few loads in small amounts, keep notes, and trust what the pistol does with your suppressor over what any article, including this one, says it should do.

Editorial note: This is an independent editorial overview built from manufacturer specifications and publicly available information. We have not performed hands-on testing of the products discussed, and nothing here is a performance guarantee. Verify specifications, compatibility and legality for your own situation.

Frequently asked questions

What is the best ammo for a suppressed FN 502?

There is no single answer, because pistols and loads interact. Start with small samples of several loads and see which one cycles reliably in your gun, with your suppressor.

Is all .22 LR ammunition safe to use in a suppressor?

Suppressor makers publish their own guidance on rated calibers and ammunition, so read the manual. Jacketed or copper-plated bullets are a common topic in such guidance, so do not assume every load is fine.

Will subsonic .22 LR cycle the FN 502?

Some subsonic loads cycle readily in some guns and not in others, and we have not tested this pistol. Try a few and keep notes.

Does lead-free ammo make cleaning easier?

It may reduce lead residue, but it does not remove the need to clean, and other cartridge components can still leave residue. Treat it as one factor, not a guarantee.