The Lazzeroni round is listed in QL with a case capacity of 121gr, and online discussions show it between there and 130gr of H2O capacity. Using the values in QL, it shows velocities in the 3800+ range for the 140gr Nosler Accubond, and aroudn 3050 for the 175gr ABLR. That's with a 24" barrel, and at pressures in the 66kpsi range, which is within Lazzeroni specs. Bear in mind this case is .580" at the case head, so it's bigger in diameter than even the 404Jeffrey based stuff like the RUMs and the 375Ruger. Bear in mind, also, that the barrel life on the Lazz is probably something like 400-500rds, optimistically, under best conditions, as this thing is burning between 95 and 115gr of powder per round, through that .284cal bore.