Generally this presents as reloading before and after every encounter in a game even if only 1 or 2 shots were fired and the clip has 60 rounds. A gamer with the disorder will experience the distracting need to reload if they know their clip isn't full, similar to an itch or a nervous tic of other OCDs.
In its worse presentations, OCRD will leave a player absent-mindedly reloading before the action has finished, perhaps after killing one or a few enemies while more are still shooting at the player. This leaves the player useless and vulnerable for upwards of 5 to 10 seconds.
Gamer: "Ah man. I have OCRD (Obsessive Compulsive Reloading Disorder) bad! I keep having to reload needlessly in the middle of action and getting raped because of it. It's ruining everything and I just can't stop myself."
Gamer's friend: "Oh yea man, we've all had that. Sucks to be you, I guess."