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Not by that, sounds like someone has modified the rifle to take a 45-70 like variant.
The 45-70 itself, just won't fit, rim is way too big.
Suggest a chamber cast, or visit to your local smithy.
It's the 458 Win shortened to 2" and equivalant to the 450 Marlin. If it's in a big bore you can load to 43000PSI or so and shoot 350 grain bullets at 2000ft/sec.
Due to the limited size of the chamber walls in a BB94 don't take a fat case like this up to 50,000PSI!