Originally Posted by Kwesi
PCJim: oops! Yes 1/1000 shorter. I was wondering if the thicker copper jacket has any significant affect? Regarding shorter vs longer bullets: isn't shorter only a potential safety blanket anyways?
Short answer, yes, all other things equal. Whether the jacket is thick or thin would not matter if the outside dimensions of the bullet (length, diameter, ogive, bearing surface) are all the same. What could change is the bearing surface between the two bullets, as one may have a more pointed nose/ogive. This would have some bearing on the performance which is why I qualified my answer by stating "if you are not pushing max charges".
If the shorter projectile is seated to the same COL as your prior loads, you should have .001 x diameter more volume in the case, your "safety blanket".