Dugaboy-

Thanks for your notes there. According to what you've said it seems my rifle was made in Manchester, May of 1985
It's stamped Manchester, it's also stamped with the CZ logo.

Any way you cut it, it's a very nicely outfitted and slicked out .458

4Seventy-

I've done a fair bit of homework on what's available in 300gr for the .458 After a talk with one of the guys at Barnes, thier 'original' jacketed JSP will fly nicely from 2500+ FPS down to somewhere in the 1800 FPS range out at three hundred yards. They recommend 64-69gr of Reloader 7
That's with either the original JSP or the pointy 300gr X-bullet. They claim the jacketed lead bullet's up to the velocity, I'll likely start with it for light bullet/extended range workup for the 300yd leaf.

--Tinker