When I started loading for my 1895 M 450 I pulled a bullet and dumped the powder in a scale, it weighed 58.0gr and it was a ball powder. I look up loads in manuals and internet for 350 gr Hornady bullets and ball powder with 58.0 gr. I found H322 in Hornady data that listed 58.0 as max with the 350 FN Hornady at 2200fps! I loaded this combo and it chronographed exactly as factory loads and it also shot at the same POI with the same 1" groups at 100 yds! I have been using this load for years now and even tried this load in other rifles and it works great in those also! BTW I tried the 325 gummies in mine and a friends rifles and it didn't shoot well in either rifle! Just FYI!