Further to what Dan has said, my 14 bore rifle needs 180gr. 2F to achieve 1,600fps. I standardized mine at 165gr. 2F for hunting, which produces 1,500fps to 1,550fps. That gives me a point blank range of 120yards(3" above of below LOS)

With it's 480gr. ball, it's fun for a very few people, only. No one at my club will shoot it but they all marvel at it's accuracy and hitting power out to 300yards. I have to refrain from using it's 'hunting' loads on the bush trail as it badly damages (cups) our steel targets and breaks their chains and splits clevices - yes, they are thick, heavy chains and clevices. It's fun to watch heavy 1/2" and 5/8" steel plates dance in the sunlight that's streaming in through the tree branches.