I wonder why (for sales and marketing reasons) that the company does not warn consumers of this little fact that 70-90 grains is the recommended load?

I think our forum members have tested and shown those very facts. While the powerbelt when used properly is a great projectile, when pushed to hard they become a rather iffy choice. Especially if not a broadside shot.

Speaking of conicals,I have a listing from REAL conicals that suggests they should be used with 70 grains of powder. So maybe what we need to consider is, big conicals do not need big powder charges.

Although yesterday when shooting the new White Bison, I discovered that it really likes 90 grains of Pyrodex P and the .503 460 grain conical. I looked that up on Doc White's web site and he lists the velocity at only around 1380 fps I believe. Its the energy that I found most impressive. Even out to 200 yards these things still have it.