I think the same as Rob404.Take these opinions with a grain of salt, I own/owned a few Zastava/Whitworths one in 375HH and one in 7-08 even one in 8mm are they state of the art hell no but neither is a CZ550 or a Winchester (also own a few of them) My Interarms are very reliable in my opinion and my Interarms/Zastava in 375HH shoots better groups at 200 meters than my Winchester in the same caliber for a lot less money. As for making a 458 win cal into a 458 Lott just find a competent Gunsmith to do the re-chambering