Ammo used, PMC 38spcl 132 gr FMJ, PMC .38spcl 125gr HP and Remington .357mag 110gr SJHP. The gun handled amazingly well, especially with the PMC 132gr FMJ, good accurate range round. Equally as impressive was the Remington 357 mag 110gr HP loads. The GP100 was dead on with these two loads, no need for site adjustment. Very glad I made this purchase. Still can't believe I got it used but never fired for $269.