Old style Speer Grand Slams, bonded? yes, still cup and core? yes.
The Grandslams were never bonded.
Be danged, learn something new here everyday, thanks Teeder, thought I remembered reading something about 900 degrees of molten lead core poured in, maybe just a Hot-Cor with thicker jacket?
Quite a few people think the Hot-Cors and Grand Slams are bonded, apparently even some gun writers,.because one published an article in a major magazine a year or two ago, and neither he nor the editor knew they're not.
The cores are indeed formed by injecting molten lead into the empty jackets. But the jackets aren't heated, so the cores don't bond to them. You can prove this by putting a Hot-Cor or GS in a vise, nose up, and hacksawing down into the nose. The jacket can then be easily peeled off the core.
They will also lose their cores occasionally on game. I have seen this personally--the first time when the jacket stayed at the entrance hole, and the core kept going.
