It is really a three piece bullet, soft aluminum nose cap, gilding metal base, lead core. The idea is the soft aluminum cap protects that large section of lead core during handling, but gives way fast when fired and hits something, supposed to be a fast large expander.
I have a box of the Remington Hi-Speeds sitting on a shelf that will likely never be fired. If I come across an old box of ammo that is period correct for a rifle I have, I tend to pick it up for nostalgia alone.
My first big game hunt for wild pigs was my Senior year of high school 1973. My Dad took me out of school for 3 days and we drove from Ohio to thr Cumberland Mtns of Tennessee. We hunted at a private Boar Hunting Lodge, named Parched Corn Creek Lodge. I had a new Marlin 30-30 with iron sights. And shot my first pig on the second morning with 170gr Winchester Silver Tips. It was a standing shot at about 50 yds in large open hardwoods on a slope. The round hit the pig broadside square in the shoulders...and passed thru. The pig ran about 30 yds downhill and stopped when he crashed head-on..into a big oak tree trunk. I was a bloodied Big Game Hunter.... I Love Silvertips