as much as i love the pump-action shotguns, this inaccuracy bugs me; when you reload a shotgun with a 9 round magazine tube, you see the character put 9 shells in the tube then chamber one. that would mean that there should now space for one more shell in the tube, letting player top off, rewarding them for being proactive and vigilant, and i think it would make the game that much more immersive (also its fun to press more buttons more often)
id reccommend that shot guns have their magazines reduced by 1 and then have the top off +1 mechanic added to preserve magazine balance on the affected guns.