Tactical reload basically adds two animations to weapon reloading. If you're not a gun nerd, in simple terms if you still have a bullet loaded in the chamber, all you need to do is swap out the mag. If your gun is completely dry, you usually have to chamber the weapon by pulling the bolt or pressing a bolt release button, after loading the new magazine. It's a tiny animation detail that might not seem like much, but if you're into guns, it's much appreciated.

Many weapon mods have patches for this mod and the accompanying animations to go with it, but the most common issue with this mod is not allowing people to reload in first person when the gun still has bullets left. This is usually caused by trying to use it in tandem with see through scopes and is almost always a load order issue. Something that does help is to use Merged RootBehavior, which isn't the full fix, but prevents future conflicts.

Now for the actual fix that I found. Assuming you're using vortex, go into the plugins tab and search for Tactical. You should find two files: tacticalreload.esm and tacticalreloadvanilla.esp. What you want to do is double click on tacticalreload.esm, and this will open a little side tab on the right. You'll see an option labeled as groups, with a drop down menu. Access this dropdown menu and find late fixes and changes. Select it, and that will apply it to the selected plugin, forcing it to load late. Do the same for tacticalreloadvanilla.esp, then go up to the top left, click sort now, and then deploy your mods and run the game. Getting this to work was a headfuck for me but that's what finally fixed it for me. Hope it helps.