Nice reasons y'all
But the real reason is a nasty ad campaign when Lee introduced the crimp die. Speer is a Blount company. So is RCBS. There is no love lost between these two companies.
Lee's campaign showed accuracy improvements with their crimp die. RCBS showed bullet damage from this die. RCBS even went as far as showing it HURT accuracy with Speer bullets.
As things go, it became bad press for Lee so for revenge, they recommend not to use Speer bullets with their Factory Crimp dies. Some Speer bullets are plated but most are still drawn.
As far as lawsuits, I don't really know if it got that far.
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