You will have to contact Browning.
about 3.5 km shooted from 375 magnum rossi taurus 2 in parel
50-375 usd
If it's the 440 magnum it had 375 horse and if it was a plain 440 and not the magnum it had 365 horse.
The first, and probably the first practical and popular belted magnum cartridge is/was the .375 Holland & Holland Magnum. The first NON-magnum belted cartridge was the .400/,375 Nitro Express H&H cartridge. See link below for more information
Off the line it was rated at 375
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$1500
100-1000 usd
100-375
Browning.com for a manual and serial number dating.
$300-$375, depending on exact version and condition
Highly recommend you seek the services of a professional gunsmith.