How do I reload cancel in KF2 now?

Start the reload, wait until the magazine counter at the bottom right of the screen shows a full magazine, then press the bash button.

Does the iron sight toggle still cancel reloads?

Not after the update this guide was written for. The old iron sight toggle method stopped working.

Is there another way to cancel a reload?

Yes, swapping weapons also cancels the animation, but the author finds bash cancel faster and more effective.

Tactics

KF2 Reload Cancel: Bash Cancel After the Iron Sight Patch

Reload canceling means skipping the tail end of a reload animation once the ammo is already back in the gun, so you can shoot sooner. This short guide was written the day after an update that removed the old method, which was toggling the iron sights during the reload. The replacement uses the bash button.

The method

Start the reload animation as normal.
Watch the magazine counter at the bottom right of the screen and wait until it shows a full magazine.
Press the bash button. The reload animation is cut and you can fire again.

Alternative

You can also cancel the animation by swapping weapons. The author tested both and found the bash cancel much faster and more effective.

Notes

Cancel only after the counter is full. Bashing earlier interrupts the reload before ammo is loaded.
The behaviour is tied to the game version the guide was written for, so if a later patch changes it, check community notes.
Related technique pages: Berserker reload bash cancel and combos and C4 bash trick.

FAQ

How do I reload cancel in KF2 now?: Start the reload, wait until the magazine counter at the bottom right of the screen shows a full magazine, then press the bash button.
Does the iron sight toggle still cancel reloads?: Not after the update this guide was written for. The old iron sight toggle method stopped working.
Is there another way to cancel a reload?: Yes, swapping weapons also cancels the animation, but the author finds bash cancel faster and more effective.