I've shot win 300gr, rem 300gr and 405gr and PMC 350gr +P factory ammo, they all shoot pretty darn good, plenty good for deer hunting!!
rms270hr, I think you'll find that Hornady hasn't released the .444, .45-70 and .450M Leverevolution ammo yet, it's not scheduled for sale until June, the last I read, only the .30-30 and .35 Rem ammo is available now. Lots of new, unreleased products show up in retail catalogs long before they're available, Simmons Master series scopes are a good example. But, if you find otherwise on the Hornady ammo, please let us know, there are a bunch of levergun shooters just chomping at the bit to shoot it!!
Tim
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=413144