The 11.5gr loads keep things under 12,500 psi, which is SAAMI max. The 16.5gr load listed in Handloader doubles the pressures, but they are not excessive for a modern 44 Spl. I wouldn't bother with any slow powder at the low pressure limits of SAAMI, but especially not a ball powder... Now at the 25k level, it is interesting... Just don't use it in old guns.