A friend inherited some older .45 ACP reloads from an old-timer (now gone) reloader friend; and, the bullets in the cartridges are some I have never run across in my years of reloading – perhaps someone in this forum can offer an identification, re: manufacturer, model, weight, etc. The bullets have 6 vertical slots that seem to run from near the base to near the tip, but the tip is solid; and, I don't want to pull one to weigh it. Seems like it was developed for rapid and serious expansion – anyone have experience with, or know the history of, them?