I am giving the X-treme 38 sp 158 gn RNFP plated bullets a go for the first time. I am using 4.2 gn of HP-38. I seated the bullet to the cannelure and applied a medium crimp. Am I right that the resulting OAL, which was 1.405, is not that important. It has plenty of room in the cylinder. I have two manuals and neither had a 158 gn bullet with a similar profile. If I am off base with either the powder charge or the OAL, I would appreciate someone setting me straight. Thanks.