Good post, lancaster. I am not familiar with those two exceptions, the gold and sabot.
The problem is sometimes someone will question a product, like
"wouldn't hard lead Brenneke slugs be dangerous through tight full chokes"
That question is passed on in another forum, as: "tight full chokes should not be used with those hard Brenneke slugs".

3 or 4 more posts, and "slugs should be shot through any choke but cylinder bore, ie: no choke."

PLEASE don't report this as me saying it.