My 6PPC barrel has a .262 neck. My brass is cut to .0085 neck thickness. I have been using a 259 bushing. Bullets do not seem to fit tight and if a round is chambered and then extracted, the bullet will remain in the barrel causing a mess. I have the next two smaller bushing and am leaning towards the .257. I assume that if I do this, I will need to adjust the powder load. Am I correct?