The only time I ever eventually had a problem using earlier day +P loads was in a 642 J frame airweight . After many thousand of rounds it really loosened up . I contacted S&W , was honest and just told them I shot it to death . He laughed , said send it back . In about 4 wks it came back , good as new . I don't buy the latest load manuals . I don't care about the newest powders . I have what works for me using the older manuals . My favorite load in a 44 special is what is commonly known as the Skeeter Skelton load , 7.5 grs of Unique with the Keith 245 gr swc (H&G 503 ) and yes I have that mold . Actually he got that from Elmer Keith but most don't know that . Regards Paul