Flat top is a different beast from a regular Blackhawk.
Interesting. What's the pressure limit on the flat top? Will they handle the 30,000 PSI loads for a std Blackhawk or old Vaquero? Are they limited to Colt SAA loads? Or somewhere in between?
How fast can you run that 280?
Tom
Check out Brian Pearce's article in "Handloader" No. 275 on the pressure levels for the Flattop. I use Pearce's load of 10gr Alliant Power Pistol for 1050fps. The Flattops are not meant for the 30k psi loads of for the standard Blackhawk. I've got a 45 Colt Blackhawk as well, for that purpose. An Accusport stainless Bisley model I bought new in 2005. It's front sight is high enough to accomodate hot 300gr loads at 50 yards.
