The 581's were made on the same lines as the 788, 540X, 541S. All of them were/are good shooters. I have the same gun as you. I restocked mine, glassed it and took the trigger apart and stoned every surface I could get to including the pinholes. I put in a softer trigger return spring also. Mine likes Eley 10X and will put 10 of them into .490" @ 50yds. Those 500 series guns are keepers for sure. The stock on mine was a mess when I bought it so that's why I replaced it.