rskent said:
^^^ But the technology behind them supposedly does.
Not always for the better. I've been in engineering for nearly 30 yrs, and have seen a lot of changes, both for the better and plenty not. Too many changes are made for economics and/or politics, and not for sound engineering reasons.
I'll give you one example: ROHS. Great idea in principle - reduced lead in the environment and removing it from the waste stream. (We'll forget about where it comes from in the first place, for sake of argument). But with proper handling and disposal, it's fairly easy to recover.
So what's wrong with ROHS? I contend they went too far with it, going from 40% lead to 0%. 2-3% lead would provide most of the benefits, and would have allowed time to investigate alternative technologies. Lead makes a fantastic solder. A lot of old electronics still work just fine, but the newer ones are more prone to premature failure. Do a search on tin whiskers, and you will find that most alternatives are prone to developing metal whiskers by a process that is still not well understood. I figure it was a built in obsolescence law to ensure a revenue stream for all interested parties - including the tax man.
Anyway, back to the OP, good find!
I was given some old bullets by an old fart who quit reloading, just one of a couple boxes things he threw in when I bought some old primers. Unfortunately it's a collection of odds and ends, meaning no more than a dozen that match each other out of a box of 50 or so. They were obviously left-overs and the odd-ball rescued from the floor tossed into a box on the bench. Not sure they are even useful for blasting - not enough of any one type.