How do I reload faster in KF2 without the perk?

Start the reload, and when the ammo counter jumps to a full magazine, click aim down sights. That cancels the rest of the animation but keeps the reload.

What happens if I interrupt too early?

The reload is cancelled and you have to start again.

Tactics

KF2 Fast Reload Without the Reload Perk: ADS Cancel

After the Incinerate update added weapons like the M79 and dual pistols, slow reloads left players exposed. The reload-speed skill sits at a high perk level, but there is a trick that works at any level, though not as fast as the skill.

The technique

Take the dual pistols. Press reload with the counter at 0. The character pulls out a magazine and inserts a new one, and the counter goes from 0 to 30. The moment it shows 30, click aim down sights. This interrupts the animation but not the reload itself, so you skip about half the reload time and can fire again. Interrupt too early and the reload is cancelled.

Dual pistols with the ammo counter at zero The ammo counter at 0: start the reload here and watch the number.

Getting the timing right

Watch the ammo counter (most reliable). When it changes from 0 to the full magazine size, interrupt with ADS.
Watch the magazine (harder). Once the character drops the old magazine and seats the new one, often with a click, interrupt. This is difficult in dark places or in a busy fight.

You do not have to fully aim down sights; a single click is enough. It works better with the hold-to-aim setting. The trick suits magazine-fed weapons far better than shotguns.

Weapons the author tested

AR-15, AK-12, SCAR-H, LA85, AA12, M79, 9mm pistol, dual 9mm, HX25 and RPG.

FAQ

How do I reload faster in KF2 without the perk?: Start the reload, and when the ammo counter jumps to a full magazine, click aim down sights. That cancels the rest of the animation but keeps the reload.
What happens if I interrupt too early?: The reload is cancelled and you have to start again.