Most of the commercial cast bullets are pretty hard. Contrary to popular belief they will lead your bore especially if they are slightly undersize for the bore. Best bet would be to slug your bore to get the actual diameter. Then contact one of the custom casters such as Beartooth Bullets or Montana Bullet Works. There are others but these are 2 that I have had pleasnt dealings with. They have a store house of information and will be able to help you find what you need to fit your parameters.