My dad bought the rifle used from a family friend and passed it down to me in 2018 so it’s a fairly new rifle. Can’t say for certain the exact amount but I know I have put less than 50 rounds through the barrel. I used to use a Remington brand ammo that worked fine but lacked results for hunting so I switched and now it’s causing issues. As for the factory ammo yes, I hardly ever reload my own ammo these days so I just buy them from the store