I have to say that any benefit the 577 BPE may have is moot unless you are hunting something beyond elk. Yes, the recipe for greater penetration is there, but how much do you need?

With the adjustable regulation of the CSMC PH, you can load the hardened paradox style "bullets" made by dixie or the WR style (cast you own) bullets, for enhanced penetration over the typical 2 3/4" hull, expanding sabot slug of ~260grs.

I don't think you'd find the ~260gr peremium sabot slugs giving to little penetration for the lower US. And you can go to you're local gun shot, or Wally mart and buy a box of sabot slugs, say the Winchester Partition Gold loading at 1900fps, and without hesitation, use it on anything in the lower US. Likewise Federal's Barnes sabot slug loading.

JPK