Open creation kit, find "Tactical Reload Vanilla Weapons" and set it as active.
Then go into "Race" and then "HumanRaceSubGraphData" type in the filter 1st and look for the "animsDoubleBarrelShotgun".
Click on it go to the path and right click and pick "New" find the file path Meshes/Actor/Character/_1stPerson/Animations/Pistol then move the file path up one it should be above the common file path them hit ok.
Then save your changes and your done. Makes sure that Tactical Reload Vanilla Weapons esp is loaded after my esp .