The M95/24 is often mistakenly attributed to Bulgaria, but 8x57mm IS was never a standard caliber of the Bulgarian military.
The smaller 6-lug action (in two lengths) is used for the 240 Weatherby, and all standard calibers.
On the other hand, standard military calibers such as 5.56x45mm NATO and 7.62x51mm NATO are available in civilian loads and with civilian bullet.
DuBiel rifles were chambered for currently standard calibers from .22-250 through .458 Win.
The Mauser M 98 internal magazine has a 5+1 magazine capacity in standard calibers and 4+1 in magnum calibers.
For many years it was the most common chambering for heavy double rifles after the .470 Nitro Express, and it continues to be the standard caliber for H&H doubles.
It used a specifically designed cartridge with a standard caliber of 7.9 mm, but a very large 94 mm long case (nominal 7.92x94mm).
The PDR is one of the few personal defense weapons to use a standard caliber.
The standard calibers used by the world's militaries tend to follow worldwide trends.
The .577 is notable as the standard caliber of professional ivory hunters in the 19th and early 20th centuries.