Originally Posted by
Thundermaker
I am putting the same amount of powder in the case as the old loads, but I'm getting about 300fps less velocity. However, my rifle has the same slow twist as the original. That's why I'm thinking that velocity might be an issue. Wouldn't be the first time I've seen it. People often forget that bullet stability is achieved by spinning a given bullet at a certain RPM, and RPM is a function of twist rate and velocity.
If there is an argument over that subject, you can be sure it won't involve me.
As far as "hard cast" bullets, does air-cooled COWW qualify as such? Looking at some brinell hardness charts, it's the same hardness as the 16:1 alloy that a lot of the BPCR shooters are using.