My Rossi M-92 loves those truncated cone bullets. I don't feed it RN FP bullets anymore, too many hiccups and jams. Jacketed bullets work well.
Colorado Cast bullets in Montrose CO makes TC bullets in 125 and 145 grains and they are VERY popular in the Cowboy guns.
A very smart friend with the same model Rossi told me early to ALWAYS make the ammo to an overall length of 1.550", whether you use 357 brass or a 38 Special case. Load appropriately for your intended shooting, To make my loading task easy I put the 125s in 38 Special brass (at 1.44") and use the 145s in either case in the M-92 at 1.55", easy to see what power level each round contains. A taper crimp (LEE 380 ACP) holds the bullet in place in the magazine tube (or my revolver cylinder).
