Re: Berger Bullet Question
While Bryan's already been here/done this, I will add one thing; Berger has developed a method whereby un-lubed cores are seated into jackets that have lubrication only on the outside of the jackets. This is unlike any other manufacturer that I've ever seen, and should add considerably to the adhesion between core and jacket. Others use a lubircant on both the jackets (inside and out) and on the core itself to facilitate their assembly at the bullet press. This is necessary for production, at least with the machinery they've always used (and still do). The lube is required to prevent the components sticking during assembly. Unfortunately, it may also have the effect of preventing the core and jacket from sticking together at impact, or at least is a very likely contributing factor in jacket/core separation.
Berger uses a completely different process to assemble jacket and core, which allows no lube on the interior surfaces of the soon to be assembled components. No lube during assembly, no lube to facilitate separation in the terminal performance. Just a little something that's worth considering.