The trouble with manufacturing big bore rifles is that there are many, many available in the second hand market. Let's face it, most of these never get shot enough to wear out any parts. That is true at least for quality made rifles.
Here are a couple of mine that need to find new caretakers...
1. CZ 550 Magnum modified by Matrix Engineering and rechambered to .458 Lott. Barrel is marked .458 Win Mag and .458 Lott (Laser Engraved). It will of course feed and fire the .458 Win cartridge also. I've mixed Win and Lott dummy cartridges and this rifle feeds them from magazine to chamber to ejection like warn butter! It has better sights, 23" barrel, 3-position M-70 type safety, straight bolt handle, sling stud on barrel, and Bells and Carlson composite stock.
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2. Voere M98 .458 Win made in Austria about 1970. Tang safety, 25" barrel.
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If the OP or anyone else is interested, please PM me.
I will post these in the classified forum when I can take better photos.