Unless high condition with original box & contents I'd shoot it . I know I shoot mine . 12.5grs 2400 with a Lyman 358429 or 358439 ( Keith designed ) SWC shoots quite well in mine & is equal to a mid range 357 load . Can hold the 10 ring on a NRA B-6 target @ 50yds . Other loads that work well are 6.5grs Unique & 7.5grs 800X with the same bullets . Original Keith load was 13.5grs 2400 , but newer Alliant 2400 is faster than the old Hercules 2400 . I'd start @ 12.0grs & work up .2grs @ a time until you find a load you like . Std pressure load that shoots well is 5.0grs Unique with same bullets . If you don't cast , Rimrock sells the same bullet ( get the 12BHN alloy ) with good lube .