when i pushed the bullet in towards the bottom i couldn't push it down anyfurther and it was about 2 inches away from the bottom as if the bullet was a little big
This is just a guess based on that little bit of information. ButI'm guessing the gun is not new, that it's been shot before and not cleaned as well as it should have been, and there's a rough/rusted/dirty spot down near the breech that's stopping the bullet from seating completely. We need a little more info as to which specific bullet and sabot you bought.