Anyone use them? Worth spending money on?

A generic internet search turns up only few threads about how the advertised velocity doesn't match the package labeled velocity, how their range ammois not good,  how their new ammo all went bang, and how their brass wasn't pretty.

Everything else is bear related like what round for them and such.

https://lehighdefense.com/reloading-bullets/xtreme-penetrator.html

never bought any Grizzly ammo, have reloaded Lehigh defense Xtream Penetrator  45-70 & 44Mag and Barnes Solids in .375 H&H.  If you are after deep penetration, bullet design and adequate caliber make a difference more so than who loads the ammo.  I've always had great performance from Barnes bullets. Also important to test in your firearm to see how tight the group is because different twist barrels prefer different weight bullets.

Knowing intended use and specific caliber could be helpful.

For fun, with my new 450 bushmaster build.

Edited to add: I would purchase a large amount to zero with and shoot gongs with.

They're having a labor day sale that is hard to ignore, unless there's something wrong with their ammo.

No problems when I used it.