I have the Pedersoli but haven't heard any bad about the Armi, If you watch the pressures my Pedersoli says stay under 29,000 cup there are a lot of fun loads both BP & smokeless that will shoot well in it. I like the 405 & 500 gr bullets use the 405 as plinkers.
Just my .02 cents both there is more steps to loading BP then smokeless, I use 5 dies for BP and 3 for smokeless. Hodgdons webstite has some nice loads in smokeless. I even load 11 grs of unique behind a 405 bullet it is super accurate and zero recoil.
Good powders are Varget, IMR 3031, AA 5477 & 4579 but there are more do some reading.