Many years ago I was visiting Frank Wheeler (which tells you how many years ago that was) and and got a couple of 7.62x54R rounds that Frank said were sintered iron bullets. I still have one and the headstamp is 60 44. I recently found another 6 of the cartridges that appear identical-even the same headstamp. both rounds weigh 340gr. The round from Frank is on the bottom of this photo and the lower bullet knurl photos is from the cartridge from Frank.
Is this actually a sintered iron bullet, and if so how unusual is it.