remember if a bullet is to hard it will not grip the rifling correctly and will not be accurate, a bullet can be to hard. i use a 50/50 mix of WW and soft lead for up to around 2000 fps. in 30-30 ad 32 win. special with no leading to speak of. if you size and lube correctly and use a gas check over 1200 fps you will be fine. if a bullet is not sized right hot gas will cut around the bullet and it will melt and lead the barrel. i never can find enough soft lead i wish i had more.