Ok as some of you may remember I have a 338-300WSM handgun with a 15.5 in barrel. So last fall I quickly worked up a load that shot good - 63gr N-165 - 300SMK at 2100 fps. Now that I finally have some time I have been working to increase the velocity. Unfortunatly my chrony has been out of order untill today. So I had been increasing my loads by .2gr increments and am now at 65gr of N-165. But today when I got the chrony back working the loads were still at 2100fps. The only difference other than the powder charge is that the brass I have most recetly shot was reloaded once. So was there that much of a powder capacity increase from the reloaded cases, I only neck sized them. Or do you think that the powder is too slow and any additional powder is not getting burned anyway. Also do you think that I should be using magnum primers with this? I think I probably should be but for some reason I just haven't used them.