I just ordered 2 bullet molds for the 550 Magnum and 577 Belted Magnum. The .550 Magnum bullet is a 750 grain long flat nose with a beveled plain base. It should do about 2200 fps in the 550 Magnum. The 577 (.586) bullet is also a 750 grain long flat nose with a beveled plain base. The 750 grain .577 cast bullet will do 2200-2300 in the 577 Belted Magnum.
Pictures will be posted soon.
Next .600 Overkill and 700 AHR.