Have not found reaching the lands necessary in several 9.3x62's. The CZ's (and most others) have very long throats, since like many early smokeless cartridges the 9.3 was developed around heavy, round-nosed bullets, which required a long throat.
When I have problems getting bullets to shoot well in long-throated chambers anymore, I try seating them deeper. Often up to .10 inch deeper results in much better accuracy. (This also applies even with "standard" throated chambers and longer bullets.)
