I have some j frames done by Karl Sokol SW 642 and Two done by Teddy Jacobson SW 442 and 340 PD (both great gunsmiths) Karl told me CCI Gold Dot 38SPL 135 +P short BBL. Teddy loves and said he likes and to use Corbon 38SPL 110 +p DPX he said has good primers for positive ignition. Good luck.