No leading to speak of with the following LaserCast bullets;
44mag 20.0 grains of #2400 with LC 240 grain SWC
357mag 13.5 grains of #2400 with LC 158 grain SWC
While these are not generally considered MAXIMUM loads, they are still potent. I've read that recent Laser Cast bullets are not up to snuff compared to older production. I haven't bought any this year (plenty of Y2K stock) so I can't say whether or not this is true. Haven't tried their 45-70 slugs yet. Don't know how they'd perform with my 1895's MicroGroove rifling.
As an aside, that was decent enough of Oregon Trail to offer you a refund and send samples of their newest design bullet.
Just one of the Good Guys