These are cast out of the RCBS mould #RCB57921 which is listed as a 450 grain flat nose but these actually cast a bullet weighing about 480 grains. This is my personal favorite that I use in my 50-100-450 Model 1886 Winchester and can vouch for the tremendous penetration, 5' plus, and killing power. Bullet length .970", distance from crimp groove to nose .320".